diff --git a/statsrunner/gitaggregate-publisher.py b/statsrunner/gitaggregate-publisher.py
index f671016a11f..a02dbce7738 100644
--- a/statsrunner/gitaggregate-publisher.py
+++ b/statsrunner/gitaggregate-publisher.py
@@ -40,5 +40,6 @@
                             total[k][commit] = v
 
         for k,v in total.items():
-            with open(os.path.join(git_out_dir, k+'.json'), 'w') as fp:
+            with open(os.path.join(git_out_dir, k+'.json.new'), 'w') as fp:
                 json.dump(v, fp, sort_keys=True, indent=2, default=decimal_default)
+            os.rename(os.path.join(git_out_dir, k+'.json.new'), os.path.join(git_out_dir, k+'.json'))
diff --git a/statsrunner/gitaggregate.py b/statsrunner/gitaggregate.py
index 54f97aa8daa..8ffcbb9ae08 100644
--- a/statsrunner/gitaggregate.py
+++ b/statsrunner/gitaggregate.py
@@ -38,5 +38,6 @@
                         total[k][commit] = v
 
 for k,v in total.items():
-    with open(os.path.join(git_out_dir, k+'.json'), 'w') as fp:
+    with open(os.path.join(git_out_dir, k+'.json.new'), 'w') as fp:
         json.dump(v, fp, sort_keys=True, indent=2, default=decimal_default)
+    os.rename(os.path.join(git_out_dir, k+'.json.new'), os.path.join(git_out_dir, k+'.json'))