diff --git a/memory/jemalloc/moz.build b/memory/jemalloc/moz.build
index f9afee971f439..a4b7842554ec9 100644
--- a/memory/jemalloc/moz.build
+++ b/memory/jemalloc/moz.build
@@ -4,14 +4,7 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-# When built with --enable-debug, jemalloc3 makes headers define functions that
-# are normally inlined, and that prevents unified sources from working.
-if CONFIG['MOZ_DEBUG']:
-    maybe_unified_sources = SOURCES
-else:
-    maybe_unified_sources = UNIFIED_SOURCES
-
-maybe_unified_sources += [
+UNIFIED_SOURCES += [
     'src/src/arena.c',
     'src/src/atomic.c',
     'src/src/base.c',
@@ -46,7 +39,7 @@ SOURCES += [
 # Only OSX needs the zone allocation implementation,
 # but only if replace-malloc is not enabled.
 if CONFIG['OS_TARGET'] == 'Darwin' and not CONFIG['MOZ_REPLACE_MALLOC']:
-    maybe_unified_sources += [
+    UNIFIED_SOURCES += [
         'src/src/zone.c',
     ]