diff --git a/git-p4.py b/git-p4.py
index eb5bc28cf9..9a71a6690d 100755
--- a/git-p4.py
+++ b/git-p4.py
@@ -3563,7 +3563,8 @@ class P4Sync(Command, P4UserMap):
         changes = []
 
         if len(self.changesFile) > 0:
-            output = open(self.changesFile).readlines()
+            with open(self.changesFile) as f:
+                output = f.readlines()
             changeSet = set()
             for line in output:
                 changeSet.add(int(line))