diff --git a/gfx/cairo/cairo/src/Makefile.in b/gfx/cairo/cairo/src/Makefile.in
index aa88726dbef..72ac283a258 100644
--- a/gfx/cairo/cairo/src/Makefile.in
+++ b/gfx/cairo/cairo/src/Makefile.in
@@ -54,6 +54,7 @@ LIBRARY_NAME    = mozcairo
 LIBXUL_LIBRARY = 1
 
 ifdef GNU_CC
+OS_CXXFLAGS := $(filter-out -pedantic,$(OS_CXXFLAGS))
 MODULE_OPTIMIZE_FLAGS = -O2
 else
 ifeq ($(OS_ARCH),SunOS)