diff --git a/rules.mk b/rules.mk
index 8de3fc1e..ec71c692 100644
--- a/rules.mk
+++ b/rules.mk
@@ -60,6 +60,6 @@ clean:
 analyze:
 	@$(COBRA) basic $(INCLUDES) $(DEFINES) $(SRCS)
 
-DEPFILES := $(SRCS:%.c=$(BUILD)/%.d)
+DEPFILES := $(OBJS:%.o=%.o.d)
 
 -include $(wildcard $(DEPFILES))