--- a/memory/mozjemalloc/jemalloc.c
+++ b/memory/mozjemalloc/jemalloc.c
@@ -542,21 +542,22 @@ static const bool isthreaded = true;
  * Maximum size of L1 cache line.  This is used to avoid cache line aliasing,
  * so over-estimates are okay (up to a point), but under-estimates will
  * negatively affect performance.
  */
 #define	CACHELINE_2POW		6
 #define	CACHELINE		((size_t)(1U << CACHELINE_2POW))
 
 /*
- * Smallest size class to support.  On Linux and Mac, even malloc(1) must
- * reserve a word's worth of memory (see Mozilla bug 691003).
+ * Smallest size class to support.  On Windows the smallest allocation size
+ * must be 8 bytes on 32-bit, 16 bytes on 64-bit.  On Linux and Mac, even
+ * malloc(1) must reserve a word's worth of memory (see Mozilla bug 691003).
  */
 #ifdef MOZ_MEMORY_WINDOWS
-#define	TINY_MIN_2POW		1
+#define TINY_MIN_2POW           (sizeof(void*) == 8 ? 4 : 3)
 #else
 #define TINY_MIN_2POW           (sizeof(void*) == 8 ? 3 : 2)
 #endif
 
 /*
  * Maximum size class that is a multiple of the quantum, but not (necessarily)
  * a power of 2.  Above this size, allocations are rounded up to the nearest
  * power of 2.