diff --git a/mercurial/hook.py b/mercurial/hook.py
--- a/mercurial/hook.py
+++ b/mercurial/hook.py
@@ -36,7 +36,7 @@ def _pythonhook(ui, repo, name, hname, f
         d = funcname.rfind('.')
         if d == -1:
             raise error.HookLoadError(
-                _('%s hook is invalid ("%s" not in a module)')
+                _('%s hook is invalid: "%s" not in a module')
                 % (hname, funcname))
         modname = funcname[:d]
         oldpaths = sys.path
diff --git a/tests/test-hook.t b/tests/test-hook.t
--- a/tests/test-hook.t
+++ b/tests/test-hook.t
@@ -496,7 +496,7 @@ test python hooks
   $ hg pull ../a
   pulling from ../a
   searching for changes
-  abort: preoutgoing.nomodule hook is invalid ("nomodule" not in a module)
+  abort: preoutgoing.nomodule hook is invalid: "nomodule" not in a module
   [255]
 
   $ echo '[hooks]' > ../a/.hg/hgrc