diff --git a/models/avatars/avatar.go b/models/avatars/avatar.go
index 9f7b0c474..907210b78 100644
--- a/models/avatars/avatar.go
+++ b/models/avatars/avatar.go
@@ -19,8 +19,12 @@ import (
 	"code.gitea.io/gitea/modules/setting"
 )
 
-// DefaultAvatarPixelSize is the default size in pixels of a rendered avatar
-const DefaultAvatarPixelSize = 28
+const (
+	// DefaultAvatarClass is the default class of a rendered avatar
+	DefaultAvatarClass = "ui avatar vm"
+	// DefaultAvatarPixelSize is the default size in pixels of a rendered avatar
+	DefaultAvatarPixelSize = 28
+)
 
 // EmailHash represents a pre-generated hash map (mainly used by LibravatarURL, it queries email server's DNS records)
 type EmailHash struct {
diff --git a/modules/templates/helper.go b/modules/templates/helper.go
index 61f1f6ada..94e50200f 100644
--- a/modules/templates/helper.go
+++ b/modules/templates/helper.go
@@ -647,7 +647,7 @@ func SVG(icon string, others ...interface{}) template.HTML {
 
 // Avatar renders user avatars. args: user, size (int), class (string)
 func Avatar(item interface{}, others ...interface{}) template.HTML {
-	size, class := parseOthers(avatars.DefaultAvatarPixelSize, "ui avatar image", others...)
+	size, class := parseOthers(avatars.DefaultAvatarPixelSize, avatars.DefaultAvatarClass, others...)
 
 	switch t := item.(type) {
 	case *user_model.User:
@@ -678,7 +678,7 @@ func AvatarByAction(action *models.Action, others ...interface{}) template.HTML
 
 // RepoAvatar renders repo avatars. args: repo, size(int), class (string)
 func RepoAvatar(repo *repo_model.Repository, others ...interface{}) template.HTML {
-	size, class := parseOthers(avatars.DefaultAvatarPixelSize, "ui avatar image", others...)
+	size, class := parseOthers(avatars.DefaultAvatarPixelSize, avatars.DefaultAvatarClass, others...)
 
 	src := repo.RelAvatarLink()
 	if src != "" {
@@ -689,7 +689,7 @@ func RepoAvatar(repo *repo_model.Repository, others ...interface{}) template.HTM
 
 // AvatarByEmail renders avatars by email address. args: email, name, size (int), class (string)
 func AvatarByEmail(email, name string, others ...interface{}) template.HTML {
-	size, class := parseOthers(avatars.DefaultAvatarPixelSize, "ui avatar image", others...)
+	size, class := parseOthers(avatars.DefaultAvatarPixelSize, avatars.DefaultAvatarClass, others...)
 	src := avatars.GenerateEmailAvatarFastLink(email, size*setting.Avatar.RenderedSizeFactor)
 
 	if src != "" {