diff --git a/config/moz.build b/config/moz.build
index 682626b245cdd..3421f4b05d1ac 100644
--- a/config/moz.build
+++ b/config/moz.build
@@ -43,9 +43,6 @@ PYTHON_UNIT_TESTS += [
 if CONFIG['GNU_CC'] and CONFIG['MOZ_OPTIMIZE']:
     CFLAGS += ['-O3']
 
-# XXX: We should fix these warnings.
-ALLOW_COMPILER_WARNINGS = True
-
 HOST_DEFINES = {
     'UNICODE': True,
     '_UNICODE': True,