diff --git a/libbeat/tests/system/test_cmd_completion.py b/libbeat/tests/system/test_cmd_completion.py
index a06259a5046c..b65eb612ea1a 100644
--- a/libbeat/tests/system/test_cmd_completion.py
+++ b/libbeat/tests/system/test_cmd_completion.py
@@ -17,7 +17,7 @@ def test_bash_completion(self):
     def test_zsh_completion(self):
         exit_code = self.run_beat(extra_args=["completion", "zsh"])
         assert exit_code == 0
-        assert self.log_contains("#compdef _mockbeat mockbeat")
+        assert self.log_contains("compdef _mockbeat mockbeat")
 
     def test_unknown_completion(self):
         exit_code = self.run_beat(extra_args=["completion", "awesomeshell"])