diff --git a/test/hooks.on-modify.t b/test/hooks.on-modify.t
index 7629b3c3f..1b6dde629 100755
--- a/test/hooks.on-modify.t
+++ b/test/hooks.on-modify.t
@@ -89,7 +89,7 @@ class TestHooksOnModify(TestCase):
 
         code, out, err = self.t(("add", "foo"))
         code, out, err = self.t.runError(("1", "modify", "+tag"))
-        self.assertIn("ERROR EXTRA JSON", err)
+        self.assertIn("Hook Error: Expected 1 JSON task(s), found 2", err)
         self.t.hooks[hookname].assertTriggered()
         self.t.hooks[hookname].assertTriggeredCount(1)
         self.t.hooks[hookname].assertExitcode(0)