diff --git a/gcl.py b/gcl.py
index f8b31aae3c..bbcba87ec9 100755
--- a/gcl.py
+++ b/gcl.py
@@ -987,12 +987,12 @@ def Lint(change_info, args):
 def DoPresubmitChecks(change_info, committing):
   """Imports presubmit, then calls presubmit.DoPresubmitChecks."""
   # Need to import here to avoid circular dependency.
-  import presubmit
-  result = presubmit.DoPresubmitChecks(change_info,
-                                       committing,
-                                       verbose=False,
-                                       output_stream=sys.stdout,
-                                       input_stream=sys.stdin)
+  import presubmit_support
+  result = presubmit_support.DoPresubmitChecks(change_info,
+                                               committing,
+                                               verbose=False,
+                                               output_stream=sys.stdout,
+                                               input_stream=sys.stdin)
   if not result:
     print "\nPresubmit errors, can't continue (use --no_presubmit to bypass)"
   return result
diff --git a/presubmit.py b/presubmit_support.py
similarity index 100%
rename from presubmit.py
rename to presubmit_support.py
diff --git a/tests/presubmit_unittest.py b/tests/presubmit_unittest.py
index 5f9e735dc2..68760ee76c 100755
--- a/tests/presubmit_unittest.py
+++ b/tests/presubmit_unittest.py
@@ -12,7 +12,7 @@ import unittest
 # Local imports
 import gcl
 import gclient
-import presubmit
+import presubmit_support as presubmit
 import presubmit_canned_checks