--- a/memory/mozjemalloc/jemalloc.c
+++ b/memory/mozjemalloc/jemalloc.c
@@ -1085,31 +1085,31 @@ static const bool config_recycle = true;
 static const bool config_recycle = false;
 #endif
 
 /*
  * When MALLOC_STATIC_SIZES is defined most of the parameters
  * controlling the malloc behavior are defined as compile-time constants
  * for best performance and cannot be altered at runtime.
  */
-#if !defined(__ia64__) && !defined(__sparc__) && !defined(__mips__)
+#if !defined(__ia64__) && !defined(__sparc__) && !defined(__mips__) && !defined(__aarch64__)
 #define MALLOC_STATIC_SIZES 1
 #endif
 
 #ifdef MALLOC_STATIC_SIZES
 
 /*
  * VM page size. It must divide the runtime CPU page size or the code
  * will abort.
  * Platform specific page size conditions copied from js/public/HeapAPI.h
  */
 #if (defined(SOLARIS) || defined(__FreeBSD__)) && \
     (defined(__sparc) || defined(__sparcv9) || defined(__ia64))
 #define pagesize_2pow			((size_t) 13)
-#elif defined(__powerpc64__) || defined(__aarch64__)
+#elif defined(__powerpc64__)
 #define pagesize_2pow			((size_t) 16)
 #else
 #define pagesize_2pow			((size_t) 12)
 #endif
 #define pagesize			((size_t) 1 << pagesize_2pow)
 #define pagesize_mask			(pagesize - 1)
 
 /* Various quantum-related settings. */