diff --git a/makefile.cargo b/makefile.cargo
index 64524a1a10..bcba4e7337 100644
--- a/makefile.cargo
+++ b/makefile.cargo
@@ -1,4 +1,4 @@
-CONFIGURE_FLAGS := --disable-jemalloc
+CONFIGURE_FLAGS := --enable-jemalloc
 
 ifneq ($(HOST),$(TARGET))
 
diff --git a/mozjs/js/src/moz.build b/mozjs/js/src/moz.build
index 85f01785f9..352d42db36 100644
--- a/mozjs/js/src/moz.build
+++ b/mozjs/js/src/moz.build
@@ -502,6 +502,12 @@ if CONFIG['ENABLE_INTL_API']:
         'icu',
     ]
 
+# https://bugzilla.mozilla.org/show_bug.cgi?id=1134039
+if CONFIG['MOZ_MEMORY']:
+    USE_LIBS += [
+        'memory',
+    ]
+
 USE_LIBS += [
     'nspr',
     'zlib',