diff --git a/util/probe_superio/Makefile b/util/probe_superio/Makefile
index 37b13b1..fb5075d 100644
--- a/util/probe_superio/Makefile
+++ b/util/probe_superio/Makefile
@@ -1,2 +1,6 @@
+CC:=gcc
+CFLAGS:=-O2 -Wall
 probe_superio: probe_superio.c
-	cc -O2 -o probe_superio probe_superio.c
+	$(CC) $(CFLAGS) -o $@ $< 
+clean:
+	rm probe_superio