--- a/memory/build/mozmemory_wrap.h
+++ b/memory/build/mozmemory_wrap.h
@@ -124,26 +124,22 @@
 #ifdef __cplusplus
 #define MOZ_EXTERN_C extern "C"
 #else
 #define MOZ_EXTERN_C
 #endif
 #endif
 
 #ifdef MOZ_MEMORY_IMPL
-#  if defined(MOZ_JEMALLOC_IMPL) && defined(MOZ_REPLACE_MALLOC) && !defined(MOZ_REPLACE_JEMALLOC)
+#  if defined(MOZ_JEMALLOC_IMPL) && defined(MOZ_REPLACE_MALLOC)
 #    define mozmem_malloc_impl(a)     je_ ## a
 #    define mozmem_jemalloc_impl(a)   je_ ## a
 #  else
 #    define MOZ_JEMALLOC_API MOZ_EXTERN_C MFBT_API
-#    ifdef MOZ_REPLACE_JEMALLOC
-#      define MOZ_MEMORY_API MOZ_EXTERN_C MFBT_API
-#      define mozmem_malloc_impl(a)     replace_ ## a
-#      define mozmem_jemalloc_impl(a)   replace_ ## a
-#    elif (defined(XP_WIN) || defined(XP_DARWIN))
+#    if (defined(XP_WIN) || defined(XP_DARWIN))
 #      if defined(MOZ_REPLACE_MALLOC)
 #        define mozmem_malloc_impl(a)   a ## _impl
 #      else
 #        define mozmem_malloc_impl(a)   je_ ## a
 #      endif
 #    else
 #      define MOZ_MEMORY_API MOZ_EXTERN_C MFBT_API
 #      if defined(MOZ_WIDGET_ANDROID) || defined(MOZ_WIDGET_GONK)