diff --git a/third_party/gtest-parallel/gtest-parallel b/third_party/gtest-parallel/gtest-parallel
index da957ebc08..4e5a9fc0ed 100755
--- a/third_party/gtest-parallel/gtest-parallel
+++ b/third_party/gtest-parallel/gtest-parallel
@@ -197,7 +197,7 @@ class CollectTestResults(object):
         # Third version of the file format. See the link in the flag description
         # for details.
         "version": 3,
-        "seconds_since_epoch": time.time(),
+        "seconds_since_epoch": int(time.time()),
         "num_failures_by_type": {
             "PASS": 0,
             "FAIL": 0,