diff --git a/sshpiperd/workingdir_test.go b/sshpiperd/workingdir_test.go
index 45becd46..391faf36 100644
--- a/sshpiperd/workingdir_test.go
+++ b/sshpiperd/workingdir_test.go
@@ -108,7 +108,7 @@ func TestCheckPerm(t *testing.T) {
 
 	err = f.checkPerm(user)
 	if err != nil {
-		t.Fatalf("fail when read 0600 user file", err)
+		t.Fatalf("fail when read 0600 user file %v", err)
 	}
 }