--- a/Makefile
+++ b/Makefile
@@ -65,7 +65,7 @@ plv8_config.h: plv8_config.h.in Makefile
 	sed -e 's/^#undef PLV8_VERSION/#define PLV8_VERSION "$(PLV8_VERSION)"/' $< > $@
 
 %.o : %.cc plv8_config.h plv8.h
-	$(CUSTOM_CC) $(CCFLAGS) $(CPPFLAGS) -fPIC -c -o $@ $<
+	$(CUSTOM_CC) $(CXXFLAGS) $(CCFLAGS) $(CPPFLAGS) -fPIC -c -o $@ $<
 
 # Convert .js to .cc
 $(JSCS): %.cc: %.js
