diff --git a/Course3/Lab4/validations.py b/Course3/Lab4/validations.py
index b18de65a2e..e1bd8bc0a9 100644
--- a/Course3/Lab4/validations.py
+++ b/Course3/Lab4/validations.py
@@ -16,7 +16,7 @@ def validate_user(username, minlen):
     if not re.match('^[a-z0-9._]*$', username):
         return False
     # Usernames can't begin with a number
-    if username[0].isnumeric():
+    if not username[0].isnumeric():
         return False
     return True