diff --git a/include/jemalloc/internal/arena.h b/include/jemalloc/internal/arena.h
index 165fb52d..59b480b5 100644
--- a/include/jemalloc/internal/arena.h
+++ b/include/jemalloc/internal/arena.h
@@ -1053,7 +1053,7 @@ arena_ptr_small_binind_get(const void *ptr, size_t mapbits)
 		run = &miscelm->run;
 		run_binind = run->binind;
 		bin = &arena->bins[run_binind];
-		actual_binind = bin - arena->bins;
+		actual_binind = (szind_t)(bin - arena->bins);
 		assert(run_binind == actual_binind);
 		bin_info = &arena_bin_info[actual_binind];
 		rpages = arena_miscelm_to_rpages(miscelm);
@@ -1070,7 +1070,7 @@ arena_ptr_small_binind_get(const void *ptr, size_t mapbits)
 JEMALLOC_INLINE szind_t
 arena_bin_index(arena_t *arena, arena_bin_t *bin)
 {
-	szind_t binind = bin - arena->bins;
+	szind_t binind = (szind_t)(bin - arena->bins);
 	assert(binind < NBINS);
 	return (binind);
 }
diff --git a/include/jemalloc/internal/bitmap.h b/include/jemalloc/internal/bitmap.h
index c14e7162..8452bfed 100644
--- a/include/jemalloc/internal/bitmap.h
+++ b/include/jemalloc/internal/bitmap.h
@@ -113,7 +113,7 @@ void	bitmap_unset(bitmap_t *bitmap, const bitmap_info_t *binfo, size_t bit);
 JEMALLOC_INLINE bool
 bitmap_full(bitmap_t *bitmap, const bitmap_info_t *binfo)
 {
-	unsigned rgoff = binfo->levels[binfo->nlevels].group_offset - 1;
+	size_t rgoff = binfo->levels[binfo->nlevels].group_offset - 1;
 	bitmap_t rg = bitmap[rgoff];
 	/* The bitmap is full iff the root group is 0. */
 	return (rg == 0);
diff --git a/include/jemalloc/internal/hash.h b/include/jemalloc/internal/hash.h
index 8b5fb037..864fda81 100644
--- a/include/jemalloc/internal/hash.h
+++ b/include/jemalloc/internal/hash.h
@@ -337,13 +337,18 @@ hash_x64_128(const void *key, const int len, const uint32_t seed,
 JEMALLOC_INLINE void
 hash(const void *key, size_t len, const uint32_t seed, size_t r_hash[2])
 {
+
+	assert(len <= INT_MAX); /* Unfortunate implementation limitation. */
+
 #if (LG_SIZEOF_PTR == 3 && !defined(JEMALLOC_BIG_ENDIAN))
-	hash_x64_128(key, len, seed, (uint64_t *)r_hash);
+	hash_x64_128(key, (int)len, seed, (uint64_t *)r_hash);
 #else
-	uint64_t hashes[2];
-	hash_x86_128(key, len, seed, hashes);
-	r_hash[0] = (size_t)hashes[0];
-	r_hash[1] = (size_t)hashes[1];
+	{
+		uint64_t hashes[2];
+		hash_x86_128(key, (int)len, seed, hashes);
+		r_hash[0] = (size_t)hashes[0];
+		r_hash[1] = (size_t)hashes[1];
+	}
 #endif
 }
 #endif
diff --git a/include/jemalloc/jemalloc_macros.h.in b/include/jemalloc/jemalloc_macros.h.in
index 698caa19..d164edac 100644
--- a/include/jemalloc/jemalloc_macros.h.in
+++ b/include/jemalloc/jemalloc_macros.h.in
@@ -11,12 +11,12 @@
 #define	JEMALLOC_VERSION_NREV @jemalloc_version_nrev@
 #define	JEMALLOC_VERSION_GID "@jemalloc_version_gid@"
 
-#  define MALLOCX_LG_ALIGN(la)	(la)
+#  define MALLOCX_LG_ALIGN(la)	((int)(la))
 #  if LG_SIZEOF_PTR == 2
-#    define MALLOCX_ALIGN(a)	(ffs(a)-1)
+#    define MALLOCX_ALIGN(a)	((int)(ffs(a)-1))
 #  else
 #    define MALLOCX_ALIGN(a)						\
-	 ((a < (size_t)INT_MAX) ? ffs(a)-1 : ffs(a>>32)+31)
+	 ((int)((a < (size_t)INT_MAX) ? ffs((int)a)-1 : ffs((int)(a>>32))+31))
 #  endif
 #  define MALLOCX_ZERO	((int)0x40)
 /*
diff --git a/src/arena.c b/src/arena.c
index 7b065d60..987e2064 100644
--- a/src/arena.c
+++ b/src/arena.c
@@ -308,7 +308,7 @@ arena_run_reg_alloc(arena_run_t *run, arena_bin_info_t *bin_info)
 	assert(run->nfree > 0);
 	assert(!bitmap_full(run->bitmap, &bin_info->bitmap_info));
 
-	regind = bitmap_sfu(run->bitmap, &bin_info->bitmap_info);
+	regind = (unsigned)bitmap_sfu(run->bitmap, &bin_info->bitmap_info);
 	miscelm = arena_run_to_miscelm(run);
 	rpages = arena_miscelm_to_rpages(miscelm);
 	ret = (void *)((uintptr_t)rpages + (uintptr_t)bin_info->reg0_offset +
@@ -3411,18 +3411,19 @@ bin_info_run_size_calc(arena_bin_info_t *bin_info)
 	 * size).
 	 */
 	try_run_size = PAGE;
-	try_nregs = try_run_size / bin_info->reg_size;
+	try_nregs = (uint32_t)(try_run_size / bin_info->reg_size);
 	do {
 		perfect_run_size = try_run_size;
 		perfect_nregs = try_nregs;
 
 		try_run_size += PAGE;
-		try_nregs = try_run_size / bin_info->reg_size;
+		try_nregs = (uint32_t)(try_run_size / bin_info->reg_size);
 	} while (perfect_run_size != perfect_nregs * bin_info->reg_size);
 	assert(perfect_nregs <= RUN_MAXREGS);
 
 	actual_run_size = perfect_run_size;
-	actual_nregs = (actual_run_size - pad_size) / bin_info->reg_interval;
+	actual_nregs = (uint32_t)((actual_run_size - pad_size) /
+	    bin_info->reg_interval);
 
 	/*
 	 * Redzones can require enough padding that not even a single region can
@@ -3434,8 +3435,8 @@ bin_info_run_size_calc(arena_bin_info_t *bin_info)
 		assert(config_fill && unlikely(opt_redzone));
 
 		actual_run_size += PAGE;
-		actual_nregs = (actual_run_size - pad_size) /
-		    bin_info->reg_interval;
+		actual_nregs = (uint32_t)((actual_run_size - pad_size) /
+		    bin_info->reg_interval);
 	}
 
 	/*
@@ -3443,8 +3444,8 @@ bin_info_run_size_calc(arena_bin_info_t *bin_info)
 	 */
 	while (actual_run_size > arena_maxrun) {
 		actual_run_size -= PAGE;
-		actual_nregs = (actual_run_size - pad_size) /
-		    bin_info->reg_interval;
+		actual_nregs = (uint32_t)((actual_run_size - pad_size) /
+		    bin_info->reg_interval);
 	}
 	assert(actual_nregs > 0);
 	assert(actual_run_size == s2u(actual_run_size));
@@ -3452,8 +3453,8 @@ bin_info_run_size_calc(arena_bin_info_t *bin_info)
 	/* Copy final settings. */
 	bin_info->run_size = actual_run_size;
 	bin_info->nregs = actual_nregs;
-	bin_info->reg0_offset = actual_run_size - (actual_nregs *
-	    bin_info->reg_interval) - pad_size + bin_info->redzone_size;
+	bin_info->reg0_offset = (uint32_t)(actual_run_size - (actual_nregs *
+	    bin_info->reg_interval) - pad_size + bin_info->redzone_size);
 
 	if (actual_run_size > small_maxrun)
 		small_maxrun = actual_run_size;
diff --git a/src/chunk.c b/src/chunk.c
index 3d32a404..9de36eb6 100644
--- a/src/chunk.c
+++ b/src/chunk.c
@@ -732,8 +732,8 @@ chunk_boot(void)
 
 	if (have_dss && chunk_dss_boot())
 		return (true);
-	if (rtree_new(&chunks_rtree, (ZU(1) << (LG_SIZEOF_PTR+3)) -
-	    opt_lg_chunk, chunks_rtree_node_alloc, NULL))
+	if (rtree_new(&chunks_rtree, (unsigned)((ZU(1) << (LG_SIZEOF_PTR+3)) -
+	    opt_lg_chunk), chunks_rtree_node_alloc, NULL))
 		return (true);
 
 	return (false);
diff --git a/src/ckh.c b/src/ckh.c
index 08fc433d..d1cfd234 100644
--- a/src/ckh.c
+++ b/src/ckh.c
@@ -99,7 +99,7 @@ ckh_try_bucket_insert(ckh_t *ckh, size_t bucket, const void *key,
 	 * Cycle through the cells in the bucket, starting at a random position.
 	 * The randomness avoids worst-case search overhead as buckets fill up.
 	 */
-	offset = prng_lg_range(&ckh->prng_state, LG_CKH_BUCKET_CELLS);
+	offset = (unsigned)prng_lg_range(&ckh->prng_state, LG_CKH_BUCKET_CELLS);
 	for (i = 0; i < (ZU(1) << LG_CKH_BUCKET_CELLS); i++) {
 		cell = &ckh->tab[(bucket << LG_CKH_BUCKET_CELLS) +
 		    ((i + offset) & ((ZU(1) << LG_CKH_BUCKET_CELLS) - 1))];
@@ -141,7 +141,8 @@ ckh_evict_reloc_insert(ckh_t *ckh, size_t argbucket, void const **argkey,
 		 * were an item for which both hashes indicated the same
 		 * bucket.
 		 */
-		i = prng_lg_range(&ckh->prng_state, LG_CKH_BUCKET_CELLS);
+		i = (unsigned)prng_lg_range(&ckh->prng_state,
+		    LG_CKH_BUCKET_CELLS);
 		cell = &ckh->tab[(bucket << LG_CKH_BUCKET_CELLS) + i];
 		assert(cell->key != NULL);
 
@@ -247,8 +248,7 @@ ckh_grow(tsd_t *tsd, ckh_t *ckh)
 {
 	bool ret;
 	ckhc_t *tab, *ttab;
-	size_t lg_curcells;
-	unsigned lg_prevbuckets;
+	unsigned lg_prevbuckets, lg_curcells;
 
 #ifdef CKH_COUNT
 	ckh->ngrows++;
@@ -302,8 +302,8 @@ static void
 ckh_shrink(tsd_t *tsd, ckh_t *ckh)
 {
 	ckhc_t *tab, *ttab;
-	size_t lg_curcells, usize;
-	unsigned lg_prevbuckets;
+	size_t usize;
+	unsigned lg_prevbuckets, lg_curcells;
 
 	/*
 	 * It is possible (though unlikely, given well behaved hashes) that the
diff --git a/src/ctl.c b/src/ctl.c
index e0044336..107bacd6 100644
--- a/src/ctl.c
+++ b/src/ctl.c
@@ -1925,7 +1925,7 @@ arenas_bin_i_index(const size_t *mib, size_t miblen, size_t i)
 }
 
 CTL_RO_NL_GEN(arenas_nlruns, nlclasses, unsigned)
-CTL_RO_NL_GEN(arenas_lrun_i_size, index2size(NBINS+mib[2]), size_t)
+CTL_RO_NL_GEN(arenas_lrun_i_size, index2size(NBINS+(szind_t)mib[2]), size_t)
 static const ctl_named_node_t *
 arenas_lrun_i_index(const size_t *mib, size_t miblen, size_t i)
 {
@@ -1936,7 +1936,8 @@ arenas_lrun_i_index(const size_t *mib, size_t miblen, size_t i)
 }
 
 CTL_RO_NL_GEN(arenas_nhchunks, nhclasses, unsigned)
-CTL_RO_NL_GEN(arenas_hchunk_i_size, index2size(NBINS+nlclasses+mib[2]), size_t)
+CTL_RO_NL_GEN(arenas_hchunk_i_size, index2size(NBINS+nlclasses+(szind_t)mib[2]),
+    size_t)
 static const ctl_named_node_t *
 arenas_hchunk_i_index(const size_t *mib, size_t miblen, size_t i)
 {
diff --git a/src/jemalloc.c b/src/jemalloc.c
index 1acea404..ced27b88 100644
--- a/src/jemalloc.c
+++ b/src/jemalloc.c
@@ -1396,7 +1396,7 @@ malloc_init_hard_finish(void)
 	 * machinery will fail to allocate memory at far lower limits.
 	 */
 	if (narenas_auto > chunksize / sizeof(arena_t *)) {
-		narenas_auto = chunksize / sizeof(arena_t *);
+		narenas_auto = (unsigned)(chunksize / sizeof(arena_t *));
 		malloc_printf("<jemalloc>: Reducing narenas to limit (%d)\n",
 		    narenas_auto);
 	}
diff --git a/src/tcache.c b/src/tcache.c
index fb1f057f..9f10a745 100644
--- a/src/tcache.c
+++ b/src/tcache.c
@@ -461,7 +461,7 @@ tcaches_create(tsd_t *tsd, unsigned *r_ind)
 		elm = tcaches_avail;
 		tcaches_avail = tcaches_avail->next;
 		elm->tcache = tcache;
-		*r_ind = elm - tcaches;
+		*r_ind = (unsigned)(elm - tcaches);
 	} else {
 		elm = &tcaches[tcaches_past];
 		elm->tcache = tcache;
diff --git a/src/util.c b/src/util.c
index 1373ee15..d519818d 100644
--- a/src/util.c
+++ b/src/util.c
@@ -581,7 +581,8 @@ malloc_vsnprintf(char *str, size_t size, const char *format, va_list ap)
 		str[i] = '\0';
 	else
 		str[size - 1] = '\0';
-	ret = i;
+	assert(i < INT_MAX);
+	ret = (int)i;
 
 #undef APPEND_C
 #undef APPEND_S
diff --git a/test/integration/rallocx.c b/test/integration/rallocx.c
index be1b27b7..022e0bf0 100644
--- a/test/integration/rallocx.c
+++ b/test/integration/rallocx.c
@@ -138,22 +138,22 @@ TEST_END
 TEST_BEGIN(test_lg_align_and_zero)
 {
 	void *p, *q;
-	size_t lg_align, sz;
+	unsigned lg_align;
+	size_t sz;
 #define	MAX_LG_ALIGN 25
 #define	MAX_VALIDATE (ZU(1) << 22)
 
-	lg_align = ZU(0);
+	lg_align = 0;
 	p = mallocx(1, MALLOCX_LG_ALIGN(lg_align)|MALLOCX_ZERO);
 	assert_ptr_not_null(p, "Unexpected mallocx() error");
 
 	for (lg_align++; lg_align <= MAX_LG_ALIGN; lg_align++) {
 		q = rallocx(p, 1, MALLOCX_LG_ALIGN(lg_align)|MALLOCX_ZERO);
 		assert_ptr_not_null(q,
-		    "Unexpected rallocx() error for lg_align=%zu", lg_align);
+		    "Unexpected rallocx() error for lg_align=%u", lg_align);
 		assert_ptr_null(
 		    (void *)((uintptr_t)q & ((ZU(1) << lg_align)-1)),
-		    "%p inadequately aligned for lg_align=%zu",
-		    q, lg_align);
+		    "%p inadequately aligned for lg_align=%u", q, lg_align);
 		sz = sallocx(q, 0);
 		if ((sz << 1) <= MAX_VALIDATE) {
 			assert_false(validate_fill(q, 0, 0, sz),
diff --git a/test/unit/hash.c b/test/unit/hash.c
index ea73d701..f50ba81b 100644
--- a/test/unit/hash.c
+++ b/test/unit/hash.c
@@ -35,7 +35,7 @@ typedef enum {
 	hash_variant_x64_128
 } hash_variant_t;
 
-static size_t
+static int
 hash_variant_bits(hash_variant_t variant)
 {
 
@@ -63,7 +63,7 @@ hash_variant_string(hash_variant_t variant)
 static void
 hash_variant_verify_key(hash_variant_t variant, uint8_t *key)
 {
-	const size_t hashbytes = hash_variant_bits(variant) / 8;
+	const int hashbytes = hash_variant_bits(variant) / 8;
 	VARIABLE_ARRAY(uint8_t, hashes, hashbytes * 256);
 	VARIABLE_ARRAY(uint8_t, final, hashbytes);
 	unsigned i;