diff --git a/include/jemalloc/internal/chunk_dss.h b/include/jemalloc/internal/chunk_dss.h
index 4535ce09..09896470 100644
--- a/include/jemalloc/internal/chunk_dss.h
+++ b/include/jemalloc/internal/chunk_dss.h
@@ -23,7 +23,8 @@ extern const char *dss_prec_names[];
 
 dss_prec_t	chunk_dss_prec_get(void);
 bool	chunk_dss_prec_set(dss_prec_t dss_prec);
-void	*chunk_alloc_dss(size_t size, size_t alignment, bool *zero);
+void	*chunk_alloc_dss(void *new_addr, size_t size, size_t alignment,
+    bool *zero);
 bool	chunk_in_dss(void *chunk);
 bool	chunk_dss_boot(void);
 void	chunk_dss_prefork(void);
diff --git a/src/chunk.c b/src/chunk.c
index a7761162..b3737180 100644
--- a/src/chunk.c
+++ b/src/chunk.c
@@ -154,16 +154,15 @@ chunk_alloc_core(void *new_addr, size_t size, size_t alignment, bool base,
 		if ((ret = chunk_recycle(&chunks_szad_dss, &chunks_ad_dss,
 		    new_addr, size, alignment, base, zero)) != NULL)
 			return (ret);
-		/* requesting an address only implemented for recycle */
-		if (new_addr == NULL
-		    && (ret = chunk_alloc_dss(size, alignment, zero)) != NULL)
+		if ((ret = chunk_alloc_dss(new_addr, size, alignment, zero))
+		    != NULL)
 			return (ret);
 	}
 	/* mmap. */
 	if ((ret = chunk_recycle(&chunks_szad_mmap, &chunks_ad_mmap, new_addr,
 	    size, alignment, base, zero)) != NULL)
 		return (ret);
-	/* requesting an address only implemented for recycle */
+	/* requesting an address not implemented for chunk_alloc_mmap */
 	if (new_addr == NULL &&
 	    (ret = chunk_alloc_mmap(size, alignment, zero)) != NULL)
 		return (ret);
@@ -172,9 +171,8 @@ chunk_alloc_core(void *new_addr, size_t size, size_t alignment, bool base,
 		if ((ret = chunk_recycle(&chunks_szad_dss, &chunks_ad_dss,
 		    new_addr, size, alignment, base, zero)) != NULL)
 			return (ret);
-		/* requesting an address only implemented for recycle */
-		if (new_addr == NULL &&
-		    (ret = chunk_alloc_dss(size, alignment, zero)) != NULL)
+		if ((ret = chunk_alloc_dss(new_addr, size, alignment, zero))
+		    != NULL)
 			return (ret);
 	}
 
diff --git a/src/chunk_dss.c b/src/chunk_dss.c
index cce71041..edba3b23 100644
--- a/src/chunk_dss.c
+++ b/src/chunk_dss.c
@@ -66,7 +66,7 @@ chunk_dss_prec_set(dss_prec_t dss_prec)
 }
 
 void *
-chunk_alloc_dss(size_t size, size_t alignment, bool *zero)
+chunk_alloc_dss(void *new_addr, size_t size, size_t alignment, bool *zero)
 {
 	void *ret;
 
@@ -93,8 +93,17 @@ chunk_alloc_dss(size_t size, size_t alignment, bool *zero)
 		 * malloc.
 		 */
 		do {
+			/* Avoid an unnecessary system call. */
+			if (new_addr != NULL && dss_max != new_addr)
+				break;
+
 			/* Get the current end of the DSS. */
 			dss_max = chunk_dss_sbrk(0);
+
+			/* Make sure the earlier condition still holds. */
+			if (new_addr != NULL && dss_max != new_addr)
+				break;
+
 			/*
 			 * Calculate how much padding is necessary to
 			 * chunk-align the end of the DSS.