diff --git a/modules/util/util.go b/modules/util/util.go
index 7a8627b5e..5dcbe448f 100644
--- a/modules/util/util.go
+++ b/modules/util/util.go
@@ -85,7 +85,7 @@ func IsExternalURL(rawURL string) bool {
 	if err != nil {
 		return true
 	}
-	if len(parsed.Host) != 0 && strings.Replace(parsed.Host, "www.", "", 1) != setting.Domain {
+	if len(parsed.Host) != 0 && strings.Replace(parsed.Host, "www.", "", 1) != strings.Replace(setting.Domain, "www.", "", 1) {
 		return true
 	}
 	return false
diff --git a/modules/util/util_test.go b/modules/util/util_test.go
index f6a282f3c..d9357ffa3 100644
--- a/modules/util/util_test.go
+++ b/modules/util/util_test.go
@@ -8,7 +8,7 @@ import (
 	"testing"
 
 	"code.gitea.io/gitea/modules/setting"
-	
+
 	"github.com/stretchr/testify/assert"
 )