diff --git a/cpp/platform/public/monitored_runnable.h b/cpp/platform/public/monitored_runnable.h
index 63e3475d..ad3cc8cc 100644
--- a/cpp/platform/public/monitored_runnable.h
+++ b/cpp/platform/public/monitored_runnable.h
@@ -65,6 +65,10 @@ class MonitoredRunnable {
   absl::Time post_time_ = SystemClock::ElapsedRealtime();
 };
 
+// These definitions are necessary before C++17.
+constexpr absl::Duration kMinReportedStartDelay;
+constexpr absl::Duration kMinReportedTaskDuration;
+
 }  // namespace nearby
 }  // namespace location