diff --git a/hg-fast-export.py b/hg-fast-export.py
index f5ac5bf..9e9e48e 100755
--- a/hg-fast-export.py
+++ b/hg-fast-export.py
@@ -552,14 +552,14 @@ def hg2git(repourl,m,marksfile,mappingfile,headsfile,tipfile,
     mapping_cache[hexlify(revnode)] = b"%d" % rev
 
   if submodule_mappings:
-    # Make sure that all submodules are registered in the submodule-mappings file
+    # Make sure that all mercurial submodules are registered in the submodule-mappings file
     for rev in range(0,max):
       ctx=revsymbol(repo,b"%d" % rev)
       if ctx.hidden():
         continue
       if ctx.substate:
         for key in ctx.substate:
-          if key not in submodule_mappings:
+          if ctx.substate[key][2]=='hg' and key not in submodule_mappings:
             sys.stderr.write("Error: %s not found in submodule-mappings\n" % (key))
             return 1