diff --git a/cmd/root.go b/cmd/root.go
index e506f2fed..a34e8b0c7 100644
--- a/cmd/root.go
+++ b/cmd/root.go
@@ -126,7 +126,7 @@ func setAllConfig(v *viper.Viper, flags *pflag.FlagSet, envPrefix string) error
 
 		for _, key := range v.AllKeys() {
 			if _, ok := validTags[key]; !ok {
-				return fmt.Errorf("invalid tag: %v", key)
+				return fmt.Errorf("invalid option in configuration file: %v", key)
 			}
 		}
 
diff --git a/cmd/root_test.go b/cmd/root_test.go
index d3aeeab1f..e1aaaf31d 100644
--- a/cmd/root_test.go
+++ b/cmd/root_test.go
@@ -178,20 +178,20 @@ func TestRootCommand_Config(t *testing.T) {
 		panic(err)
 	}
 	config := `data-dir = "/tmp/pil5_0"
-bind = "127.0.0.1:15000"
+bind = "127.0.0.1:10101"
 
 [cluster]
   poll-interval = "2m0s"
   replicas = 2
   partitions = 128
   hosts = [
-    "127.0.0.1:15000",
-    "127.0.0.1:15001",
+    "127.0.0.1:10101",
+    "127.0.0.1:10111",
   ]`
 	file.Write([]byte(config))
 	file.Close()
 	_, err = ExecNewRootCommand(t, "server", "--config", file.Name())
-	if err.Error() != "invalid tag: cluster.partitions" {
-		t.Fatalf("Expected invalid tag, but err: '%v'", err)
+	if err.Error() != "invalid option in configuration file: cluster.partitions" {
+		t.Fatalf("Expected invalid option in configuration file, but err: '%v'", err)
 	}
 }