diff --git a/Makefile b/Makefile
index 699f1ea..4813fa3 100644
--- a/Makefile
+++ b/Makefile
@@ -4,7 +4,7 @@ TARGET   := WFObj.o
 all: $(TARGET)
 
 %.o: %.cc
-	$(CXX) -c -o $@ $(CXXFLAGS) $<
+	$(CXX) -c -o $@ $(CPPFLAGS) $(CXXFLAGS) $<
 
 clean:
 	-rm -f *~ *.o