diff --git a/plat/diameter/makefile b/plat/diameter/makefile
index 1169090..3f509b7 100644
--- a/plat/diameter/makefile
+++ b/plat/diameter/makefile
@@ -27,4 +27,4 @@ $(OBJS):%.o:%.c
 
 clean:
 	rm -rf $(OBJS) $(TGT)
-	rm -rf ./lib/libdiameter.a
+	rm -rf $(TOPDIR)/lib/libdiameter.a