diff --git a/fsharp-mode-completion.el b/fsharp-mode-completion.el
index 1b632f9..6496620 100644
--- a/fsharp-mode-completion.el
+++ b/fsharp-mode-completion.el
@@ -485,7 +485,7 @@ If HOST is nil, check process on local system."
            (or (regexp ,fsharp-ac--ident)
                (regexp ,fsharp-ac--rawIdent))
            "."))
-         (group (zero-or-more (not (any ":.` ,(\t\r\n"))))
+         (group (zero-or-more (not (any "\[:.` ,(\t\r\n"))))
          string-end))
   "Regexp for a dotted ident with a standard residue.")