diff --git a/Parser/asdl_c.py b/Parser/asdl_c.py
index d7aecb58c24..147ac8d7463 100755
--- a/Parser/asdl_c.py
+++ b/Parser/asdl_c.py
@@ -1138,7 +1138,7 @@ def visit(self, object):
 
 def get_file_revision(f):
     """Fish out the last change to a file in hg."""
-    args = ["hg", "log", "--template", "{rev}:{node|short}", "--limit", "1"]
+    args = ["hg", "log", "--template", "{rev}:{node|short}", "--limit", "1", f]
     p = subprocess.Popen(args, stdout=subprocess.PIPE)
     out = p.communicate()[0]
     if p.returncode: