diff --git a/make/rules.mk b/make/rules.mk
index b09f143d..37cf9a65 100644
--- a/make/rules.mk
+++ b/make/rules.mk
@@ -214,6 +214,9 @@ strip.done: $(EXE_ALL)
 .%.o.dep.mk: %.cpp $(BUILD_HDR)
 	$(CC) -M $(BUILD_CPPFLAGS) $(DEPEND_CPPFLAGS) $< -o $@
 
+.%.o.dep.mk: %.cc $(BUILD_HDR)
+	$(CC) -M $(BUILD_CPPFLAGS) $(DEPEND_CPPFLAGS) $< -o $@
+
 .%.o.dep.mk: %.c $(BUILD_HDR)
 	$(CC) -M $(BUILD_CPPFLAGS) $(DEPEND_CPPFLAGS) $< -o $@
 
@@ -256,6 +259,9 @@ endif
 %.o: %.cpp
 	$(CPP) $(BUILD_CPPFLAGS) -c $<
 
+%.o: %.cc
+	$(CPP) $(BUILD_CPPFLAGS) -c $<
+
 %.o: %.c
 	$(CC) $(BUILD_CFLAGS) -c $<