diff --git a/truthseeker/logic/game_logic.py b/truthseeker/logic/game_logic.py
index 801e0ca..85dd838 100644
--- a/truthseeker/logic/game_logic.py
+++ b/truthseeker/logic/game_logic.py
@@ -158,6 +158,18 @@ def get_game_info(game_id):
     else:
         return None
 
+def check_username(username):
+    if not username:
+        return False
+    if not username.isalnum():
+        return False
+    if not username == username.strip():
+        return False
+    if not len(username) < 16:
+        return False
+    
+    return True
+
 def generateNpcText(npc: tables.Npc, lang: str) -> dict:
     data = {}
     data["name"] = getTextFromLid(lang, npc.NAME_LID)
diff --git a/truthseeker/routes/routes_api.py b/truthseeker/routes/routes_api.py
index d27c022..74548f9 100644
--- a/truthseeker/routes/routes_api.py
+++ b/truthseeker/routes/routes_api.py
@@ -2,7 +2,6 @@ import flask
 import json
 from truthseeker import APP
 from truthseeker.logic import game_logic
-from truthseeker.utils import check_username
 
 
 routes_api = flask.Blueprint("api", __name__)
@@ -12,7 +11,7 @@ def create_game():
     username = flask.request.values.get("username")
     if username==None:
         return {"error": 1, "msg": "username not set"}
-    if not check_username(username):
+    if not game_logic.check_username(username):
         return {"error": 1, "msg": "invalid username"}
 
     response = {}
@@ -47,7 +46,7 @@ def join_game():
     username = flask.request.values.get("username")
     if game_id==None or username==None:
         return {"error": 1, "msg": "username or game id not set"}
-    if not check_username(username):
+    if not game_logic.check_username(username):
         return {"error": 1, "msg": "invalid username"}
 
     game = game_logic.get_game(game_id)
diff --git a/truthseeker/utils.py b/truthseeker/utils.py
deleted file mode 100644
index 048dd29..0000000
--- a/truthseeker/utils.py
+++ /dev/null
@@ -1,11 +0,0 @@
-def check_username(username):
-    if not username:
-        return False
-    if not username.isalnum():
-        return False
-    if not username == username.strip():
-        return False
-    if not len(username) < 16:
-        return False
-    
-    return True