diff --git a/vpx_ports/vpx_timer.h b/vpx_ports/vpx_timer.h
index c1f1b6027..2083b4ece 100644
--- a/vpx_ports/vpx_timer.h
+++ b/vpx_ports/vpx_timer.h
@@ -83,7 +83,7 @@ static INLINE int64_t vpx_usec_timer_elapsed(struct vpx_usec_timer *t) {
   struct timeval diff;
 
   timersub(&t->end, &t->begin, &diff);
-  return diff.tv_sec * 1000000 + diff.tv_usec;
+  return (int64_t)diff.tv_sec * 1000000 + diff.tv_usec;
 #endif
 }