diff --git a/presubmit_support.py b/presubmit_support.py
index cfdcfa38a..9da419429 100755
--- a/presubmit_support.py
+++ b/presubmit_support.py
@@ -41,7 +41,8 @@ except ImportError:
     import json
   except ImportError:
     # Import the one included in depot_tools.
-    import third_party.simplejson as json
+    sys.path.append(os.path.join(os.path.dirname(__file__), 'third_party'))
+    import simplejson as json
 
 # Local imports.
 import gcl