diff --git a/services/web/project/__init__.py b/services/web/project/__init__.py
index 42825e3..5e06a42 100644
--- a/services/web/project/__init__.py
+++ b/services/web/project/__init__.py
@@ -381,7 +381,7 @@ def complete_register():
     password= data.get('password')
     country= data.get('country')
 
-    FIND_USERNAME= "SELECT * FROM members WHERE  username::text = '"+username+"'"
+    FIND_USERNAME= f"SELECT * FROM members WHERE  username::text = '{username}' "
     with connection:
             with connection.cursor(cursor_factory=psycopg2.extras.DictCursor) as cursor:
                 cursor.execute(FIND_USERNAME)