diff --git a/js/xpconnect/src/moz.build b/js/xpconnect/src/moz.build
index 7d9cd5b37f..29cfc47768 100644
--- a/js/xpconnect/src/moz.build
+++ b/js/xpconnect/src/moz.build
@@ -66,4 +66,4 @@ LOCAL_INCLUDES += [
 ]
 
 if CONFIG['GNU_CXX']:
-    CXXFLAGS += ['-Wno-shadow', '-Werror=format']
+    CXXFLAGS += ['-Wno-shadow']