diff --git a/taskmanager/routes.py b/taskmanager/routes.py
index 8e882b3..d53279e 100644
--- a/taskmanager/routes.py
+++ b/taskmanager/routes.py
@@ -29,7 +29,7 @@ def addtask():
         username = request.form['username']
         # Input sanitation
         # Task name
-        if not taskname.printable() or ("<" in taskname and ">" in taskname):
+        if not taskname.isprintable() or ("<" in taskname and ">" in taskname):
             return render_template('pages/response.html', response = "Task name has to be made only of letters or numbers.")
         if len(taskname) < 1 or len(taskname) > 40:
             return render_template('pages/response.html', response = "Task name lenght invalid, only smaller then 40 charachters allowed")