diff --git a/test/ejabberd_SUITE_data/extauth.py b/test/ejabberd_SUITE_data/extauth.py
index 263d6464e..b6a217fcc 100755
--- a/test/ejabberd_SUITE_data/extauth.py
+++ b/test/ejabberd_SUITE_data/extauth.py
@@ -13,6 +13,10 @@ def read():
             write(True)
     elif cmd == 'isuser':
         u, s = pkt.split(':', 2)[1:]
+        if u == "wrong":
+            write(False)
+        else:
+            write(True)
     elif cmd == 'setpass':
         u, s, p = pkt.split(':', 3)[1:]
         write(True)