diff --git a/dom/bindings/Makefile.in b/dom/bindings/Makefile.in
index 0bab8b4d9e6..7b4722edced 100644
--- a/dom/bindings/Makefile.in
+++ b/dom/bindings/Makefile.in
@@ -117,6 +117,10 @@ EXPORTS_GENERATED_DEST := $(DIST)/include/$(binding_include_path)
 EXPORTS_GENERATED_TARGET := webidl-export
 INSTALL_TARGETS += EXPORTS_GENERATED
 
+ifdef GNU_CC
+CXXFLAGS += -Wno-uninitialized
+endif
+
 include $(topsrcdir)/config/rules.mk
 
 # We need to create a separate target so we can ensure that the pickle is
diff --git a/dom/bindings/test/Makefile.in b/dom/bindings/test/Makefile.in
index 68d102eec46..bdb8a236bbe 100644
--- a/dom/bindings/test/Makefile.in
+++ b/dom/bindings/test/Makefile.in
@@ -73,6 +73,10 @@ MOCHITEST_CHROME_FILES = \
   test_bug775543.html \
   $(NULL)
 
+ifdef GNU_CC
+CXXFLAGS += -Wno-uninitialized
+endif
+
 # Include rules.mk before any of our targets so our first target is coming from
 # rules.mk and running make with no target in this dir does the right thing.
 include $(topsrcdir)/config/rules.mk