diff --git a/routers/org/teams.go b/routers/org/teams.go
index e9abfe791..7f8b828e8 100644
--- a/routers/org/teams.go
+++ b/routers/org/teams.go
@@ -15,6 +15,7 @@ import (
 	"code.gitea.io/gitea/modules/base"
 	"code.gitea.io/gitea/modules/context"
 	"code.gitea.io/gitea/modules/log"
+	"code.gitea.io/gitea/routers/utils"
 )
 
 const (
@@ -76,11 +77,7 @@ func TeamsAction(ctx *context.Context) {
 			ctx.Error(404)
 			return
 		}
-		uname := ctx.Query("uname")
-		// uname may be formatted as "username (fullname)"
-		if strings.Contains(uname, "(") && strings.HasSuffix(uname, ")") {
-			uname = strings.TrimSpace(strings.Split(uname, "(")[0])
-		}
+		uname := utils.RemoveUsernameParameterSuffix(strings.ToLower(ctx.Query("uname")))
 		var u *models.User
 		u, err = models.GetUserByName(uname)
 		if err != nil {
diff --git a/routers/repo/setting.go b/routers/repo/setting.go
index 5586e81f0..16cc699ae 100644
--- a/routers/repo/setting.go
+++ b/routers/repo/setting.go
@@ -16,6 +16,7 @@ import (
 	"code.gitea.io/gitea/modules/context"
 	"code.gitea.io/gitea/modules/log"
 	"code.gitea.io/gitea/modules/setting"
+	"code.gitea.io/gitea/routers/utils"
 )
 
 const (
@@ -366,7 +367,7 @@ func Collaboration(ctx *context.Context) {
 
 // CollaborationPost response for actions for a collaboration of a repository
 func CollaborationPost(ctx *context.Context) {
-	name := strings.ToLower(ctx.Query("collaborator"))
+	name := utils.RemoveUsernameParameterSuffix(strings.ToLower(ctx.Query("collaborator")))
 	if len(name) == 0 || ctx.Repo.Owner.LowerName == name {
 		ctx.Redirect(setting.AppSubURL + ctx.Req.URL.Path)
 		return
diff --git a/routers/utils/utils.go b/routers/utils/utils.go
new file mode 100644
index 000000000..6ead7d60e
--- /dev/null
+++ b/routers/utils/utils.go
@@ -0,0 +1,17 @@
+// Copyright 2017 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package utils
+
+import (
+	"strings"
+)
+
+// RemoveUsernameParameterSuffix returns the username parameter without the (fullname) suffix - leaving just the username
+func RemoveUsernameParameterSuffix(name string) string {
+	if index := strings.Index(name, " ("); index >= 0 {
+		name = name[:index]
+	}
+	return name
+}
diff --git a/routers/utils/utils_test.go b/routers/utils/utils_test.go
new file mode 100644
index 000000000..fb56ac85c
--- /dev/null
+++ b/routers/utils/utils_test.go
@@ -0,0 +1,17 @@
+// Copyright 2017 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package utils
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestRemoveUsernameParameterSuffix(t *testing.T) {
+	assert.Equal(t, "foobar", RemoveUsernameParameterSuffix("foobar (Foo Bar)"))
+	assert.Equal(t, "foobar", RemoveUsernameParameterSuffix("foobar"))
+	assert.Equal(t, "", RemoveUsernameParameterSuffix(""))
+}