diff --git a/hgext3rd/githelp.py b/hgext3rd/githelp.py
--- a/hgext3rd/githelp.py
+++ b/hgext3rd/githelp.py
@@ -27,6 +27,7 @@
     extensions,
     fancyopts,
     registrar,
+    scmutil,
     util,
 )
 from hgext import pager
@@ -273,7 +274,7 @@
     too many ways to spell revisions in git for us to reasonably catch all of
     them, so let's be conservative.
     """
-    if string in repo:
+    if scmutil.isrevsymbol(repo, string):
         # if it's definitely a revision let's not even check if a file of the
         # same name exists.
         return False