diff --git a/example/Makefile b/example/Makefile
index b117d38e..7944e263 100644
--- a/example/Makefile
+++ b/example/Makefile
@@ -53,7 +53,7 @@ $(BINARY): $(OBJS) $(BINARY).ld
 	@printf "  LD      $(subst $(shell pwd)/,,$(@))\n"
 	$(Q)$(LD) $(LDFLAGS) -o $(BINARY) $(OBJS) -lopenstm32
 
-%.o: %.c
+%.o: %.c Makefile
 	@printf "  CC      $(subst $(shell pwd)/,,$(@))\n"
 	$(Q)$(CC) $(CFLAGS) -o $@ -c $<