diff --git a/handlers/user/info.go b/handlers/user/info.go
index c92d953..4ef420c 100644
--- a/handlers/user/info.go
+++ b/handlers/user/info.go
@@ -57,8 +57,13 @@ func UserInfo(ctx *gin.Context) {
 		for _, s := range scopes {
 			if value, ok := (*userinfo)[s]; ok {
 				userinfoRes[s] = value
-			} else if s == "openid" {
+			}
+
+			if s == "openid" {
 				userinfoRes["sub"] = *tokenInfo.Sub
+			} else if s == "username" {
+				// Add "nickname" field for OIDC compatibility
+				userinfoRes["nickname"] = userinfoRes[s]
 			}
 		}
 	}