diff --git a/lib/timing.cpp b/lib/timing.cpp
index 1d760ab1..f2e02c1c 100644
--- a/lib/timing.cpp
+++ b/lib/timing.cpp
@@ -65,7 +65,7 @@ void Util::sleep(int ms) {
 long long Util::getNTP() {
   struct timespec t;
   clock_gettime(CLOCK_REALTIME, &t);
-  return ((((long long int)t.tv_sec) + 2208988800) << 32) + (t.tv_nsec * 4.2949);
+  return ((((long long int)t.tv_sec) + 2208988800ll) << 32) + (t.tv_nsec * 4.2949);
 }
 
 /// Gets the current time in milliseconds.