diff --git a/gcl.py b/gcl.py
index 72a83fdc8..8df5de1bc 100755
--- a/gcl.py
+++ b/gcl.py
@@ -960,7 +960,6 @@ def TryChange(change_info, args, swallow_exception):
       trychange_args.extend(["--issue", str(change_info.issue)])
     if change_info.patchset:
       trychange_args.extend(["--patchset", str(change_info.patchset)])
-    file_list = change_info.GetFileNames()
     change = presubmit_support.SvnChange(change_info.name,
                                          change_info.description,
                                          change_info.GetLocalRoot(),
@@ -969,14 +968,12 @@ def TryChange(change_info, args, swallow_exception):
                                          change_info.patchset,
                                          None)
   else:
-    file_list = []
     change = None
 
   trychange_args.extend(args)
   return trychange.TryChange(
       trychange_args,
       change=change,
-      file_list=file_list,
       swallow_exception=swallow_exception,
       prog='gcl try',
       extra_epilog='\n'
diff --git a/git_try.py b/git_try.py
index 27eafba37..9435fe78c 100755
--- a/git_try.py
+++ b/git_try.py
@@ -57,7 +57,7 @@ if __name__ == '__main__':
     cl = git_cl.Changelist()
     change = cl.GetChange(cl.GetUpstreamBranch(), None)
     sys.exit(trychange.TryChange(
-        args, change, file_list=[], swallow_exception=False,
+        args, change, swallow_exception=False,
         prog='git try',
         extra_epilog='\n'
                      'git try will diff against your tracked branch and will '
diff --git a/trychange.py b/trychange.py
index bd81e074c..eae4ab414 100755
--- a/trychange.py
+++ b/trychange.py
@@ -490,16 +490,19 @@ def GetMungedDiff(path_diff, diff):
 
 def TryChange(argv,
               change,
-              file_list,
               swallow_exception,
               prog=None,
               extra_epilog=None):
   """
   Args:
     argv: Arguments and options.
-    file_list: Default value to pass to --file.
+    change: Change instance corresponding to the CL.
     swallow_exception: Whether we raise or swallow exceptions.
   """
+  file_list = []
+  if change:
+    file_list = [f.LocalPath() for f in change.AffectedFiles()]
+
   # Parse argv
   parser = optparse.OptionParser(usage=USAGE,
                                  version=__version__,
@@ -806,4 +809,4 @@ def TryChange(argv,
 
 if __name__ == "__main__":
   fix_encoding.fix_encoding()
-  sys.exit(TryChange(None, None, [], False))
+  sys.exit(TryChange(None, None, False))