diff --git a/polygerrit-ui/app/elements/core/gr-router/gr-router.ts b/polygerrit-ui/app/elements/core/gr-router/gr-router.ts
index 88bacdf..e75bc32 100644
--- a/polygerrit-ui/app/elements/core/gr-router/gr-router.ts
+++ b/polygerrit-ui/app/elements/core/gr-router/gr-router.ts
@@ -118,7 +118,9 @@
 
   // Pattern for login and logout URLs intended to be passed-through. May
   // include a return URL.
-  LOG_IN_OR_OUT: /\/log(in|out)(\/(.+))?$/,
+  // TODO: Maybe this pattern and its handler can just be removed, because
+  // passing through is what the default router would eventually do anyway.
+  LOG_IN_OR_OUT: /^\/log(in|out)(\/(.+))?$/,
 
   // Pattern for a catchall route when no other pattern is matched.
   DEFAULT: /.*/,
diff --git a/polygerrit-ui/app/elements/core/gr-router/gr-router_test.ts b/polygerrit-ui/app/elements/core/gr-router/gr-router_test.ts
index e1ba42c..35ce54c 100644
--- a/polygerrit-ui/app/elements/core/gr-router/gr-router_test.ts
+++ b/polygerrit-ui/app/elements/core/gr-router/gr-router_test.ts
@@ -1016,6 +1016,12 @@
       });
     });
 
+    test('LOG_IN_OR_OUT pass through', async () => {
+      // LOG_IN_OR_OUT: /^\/log(in|out)(\/(.+))?$/,
+      await checkUrlNotMatched('/login/asdf');
+      await checkUrlNotMatched('/logout/asdf');
+    });
+
     test('PLUGIN_SCREEN', async () => {
       // PLUGIN_SCREEN: /^\/x\/([\w-]+)\/([\w-]+)\/?/,
       await checkUrlToState('/x/foo/bar', {