diff --git a/include/jemalloc/internal/tcache.h b/include/jemalloc/internal/tcache.h
index 09935c36..25eaf142 100644
--- a/include/jemalloc/internal/tcache.h
+++ b/include/jemalloc/internal/tcache.h
@@ -115,7 +115,7 @@ extern tcache_bin_info_t	*tcache_bin_info;
  * Number of tcache bins.  There are NBINS small-object bins, plus 0 or more
  * large-object bins.
  */
-extern size_t	nhbins;
+extern unsigned	nhbins;
 
 /* Maximum cached size class. */
 extern size_t	tcache_maxclass;
diff --git a/src/tcache.c b/src/tcache.c
index 426bb1f7..fb1f057f 100644
--- a/src/tcache.c
+++ b/src/tcache.c
@@ -10,7 +10,7 @@ ssize_t	opt_lg_tcache_max = LG_TCACHE_MAXCLASS_DEFAULT;
 tcache_bin_info_t	*tcache_bin_info;
 static unsigned		stack_nelms; /* Total stack elms per tcache. */
 
-size_t			nhbins;
+unsigned		nhbins;
 size_t			tcache_maxclass;
 
 tcaches_t		*tcaches;