diff --git a/Makefile b/Makefile
index 764c9e1..7bf994c 100644
--- a/Makefile
+++ b/Makefile
@@ -18,8 +18,8 @@ supervisor: supervisor.o
 generator: generator.o
 	$(CC) $^ -o $@
 
-%.o: %.c
+%.o: %.c common.h
 	$(CC) $(CFLAGS) $^
 
 clean:
-	rm -f supervisor.o supervisor generator.o generator
+	rm -f supervisor.o supervisor generator.o generator common.h.gch