diff --git a/memory/mozjemalloc/jemalloc.c b/memory/mozjemalloc/jemalloc.c
index 5e50d65f81..2adec68485 100644
--- a/memory/mozjemalloc/jemalloc.c
+++ b/memory/mozjemalloc/jemalloc.c
@@ -401,7 +401,7 @@ void *_mmap(void *addr, size_t length, int prot, int flags,
  */
 #define	CHUNK_2POW_DEFAULT	20
 /* Maximum number of dirty pages per arena. */
-#define	DIRTY_MAX_DEFAULT	(1U << 8)
+#define	DIRTY_MAX_DEFAULT	(1U << 12)
 
 /*
  * Maximum size of L1 cache line.  This is used to avoid cache line aliasing,