diff --git a/mercurial/cmdutil.py b/mercurial/cmdutil.py
--- a/mercurial/cmdutil.py
+++ b/mercurial/cmdutil.py
@@ -1961,7 +1961,10 @@ def walkchangerevs(repo, match, opts, pr
                 else:
                     self.revs.discard(value)
                     ctx = change(value)
-                    matches = [f for f in ctx.files() if match(f)]
+                    if allfiles:
+                        matches = list(ctx.manifest().walk(match))
+                    else:
+                        matches = [f for f in ctx.files() if match(f)]
                     if matches:
                         fncache[value] = matches
                         self.set.add(value)
diff --git a/tests/test-grep.t b/tests/test-grep.t
--- a/tests/test-grep.t
+++ b/tests/test-grep.t
@@ -517,5 +517,8 @@ test -rMULTIREV with --all-files
   $ hg grep -r "0:2" "unmod" --all-files um
   um:0:unmod
   um:1:unmod
+  $ hg grep -r "0:2" "unmod" --all-files "glob:**/um" # Check that patterns also work
+  um:0:unmod
+  um:1:unmod
   $ cd ..