diff --git a/src/common/mythread.h b/src/common/mythread.h
index 37b5216b..7a80f966 100644
--- a/src/common/mythread.h
+++ b/src/common/mythread.h
@@ -300,8 +300,8 @@ static inline void
 mythread_condtime_set(mythread_condtime *condtime, const mythread_cond *cond,
 		uint32_t timeout_ms)
 {
-	condtime->tv_sec = timeout_ms / 1000;
-	condtime->tv_nsec = (timeout_ms % 1000) * 1000000;
+	condtime->tv_sec = (time_t)(timeout_ms / 1000);
+	condtime->tv_nsec = (long)((timeout_ms % 1000) * 1000000);
 
 #ifdef HAVE_CLOCK_GETTIME
 	struct timespec now;