diff --git a/kallithea/lib/utils.py b/kallithea/lib/utils.py
--- a/kallithea/lib/utils.py
+++ b/kallithea/lib/utils.py
@@ -40,7 +40,7 @@ import mercurial.ui
 
 import kallithea.config.conf
 from kallithea.lib.exceptions import InvalidCloneUriException
-from kallithea.lib.utils2 import ascii_bytes, aslist, get_current_authuser, safe_bytes, safe_str
+from kallithea.lib.utils2 import ascii_bytes, aslist, extract_mentioned_usernames, get_current_authuser, safe_bytes, safe_str
 from kallithea.lib.vcs.backends.git.repository import GitRepository
 from kallithea.lib.vcs.backends.hg.repository import MercurialRepository
 from kallithea.lib.vcs.conf import settings
@@ -591,3 +591,13 @@ def check_git_version():
                     settings.GIT_EXECUTABLE_PATH, output)
 
     return ver
+
+
+def extract_mentioned_users(text):
+    """ Returns set of actual database Users @mentioned in given text. """
+    result = set()
+    for name in extract_mentioned_usernames(text):
+        user = User.get_by_username(name, case_insensitive=True)
+        if user is not None and not user.is_default_user:
+            result.add(user)
+    return result
diff --git a/kallithea/lib/utils2.py b/kallithea/lib/utils2.py
--- a/kallithea/lib/utils2.py
+++ b/kallithea/lib/utils2.py
@@ -378,17 +378,6 @@ def extract_mentioned_usernames(text):
     return MENTIONS_REGEX.findall(text)
 
 
-def extract_mentioned_users(text):
-    """ Returns set of actual database Users @mentioned in given text. """
-    from kallithea.model.db import User
-    result = set()
-    for name in extract_mentioned_usernames(text):
-        user = User.get_by_username(name, case_insensitive=True)
-        if user is not None and not user.is_default_user:
-            result.add(user)
-    return result
-
-
 class AttributeDict(dict):
     def __getattr__(self, attr):
         return self.get(attr, None)
diff --git a/kallithea/model/comment.py b/kallithea/model/comment.py
--- a/kallithea/model/comment.py
+++ b/kallithea/model/comment.py
@@ -31,7 +31,7 @@ from collections import defaultdict
 from tg.i18n import ugettext as _
 
 from kallithea.lib import helpers as h
-from kallithea.lib.utils2 import extract_mentioned_users
+from kallithea.lib.utils import extract_mentioned_users
 from kallithea.model.db import ChangesetComment, PullRequest, Repository, User
 from kallithea.model.meta import Session
 from kallithea.model.notification import NotificationModel
diff --git a/kallithea/model/pull_request.py b/kallithea/model/pull_request.py
--- a/kallithea/model/pull_request.py
+++ b/kallithea/model/pull_request.py
@@ -34,7 +34,8 @@ from tg.i18n import ugettext as _
 
 from kallithea.lib import helpers as h
 from kallithea.lib.hooks import log_create_pullrequest
-from kallithea.lib.utils2 import ascii_bytes, extract_mentioned_users
+from kallithea.lib.utils import extract_mentioned_users
+from kallithea.lib.utils2 import ascii_bytes
 from kallithea.model.db import ChangesetStatus, PullRequest, PullRequestReviewer, User
 from kallithea.model.meta import Session
 from kallithea.model.notification import NotificationModel