diff --git a/Makefile b/Makefile
index 31f987b8d7..8dc5a69cd8 100644
--- a/Makefile
+++ b/Makefile
@@ -4,4 +4,4 @@ lib:
 
 clean:
 	(cd acto/k8s_util/lib && make clean)
-	(cd ssa && make)
\ No newline at end of file
+	(cd ssa && make clean)
diff --git a/acto/k8s_util/lib/Makefile b/acto/k8s_util/lib/Makefile
index 0244bb462d..ecf1efc6d0 100644
--- a/acto/k8s_util/lib/Makefile
+++ b/acto/k8s_util/lib/Makefile
@@ -3,5 +3,5 @@ k8sutil:
 	gcc test.c -o test ./k8sutil.so
 
 clean:
-	rm ./k8sutil.so
-	rm ./test
\ No newline at end of file
+	rm -f ./k8sutil.so
+	rm -f ./test
diff --git a/ssa/Makefile b/ssa/Makefile
index 19bdcc7e47..72b9566b42 100644
--- a/ssa/Makefile
+++ b/ssa/Makefile
@@ -4,4 +4,4 @@ analysis:
 	go build -buildmode=c-shared -o libanalysis.so ssa.go
 
 clean:
-	rm ./analysis.so
\ No newline at end of file
+	rm -f ./analysis.so