diff --git a/src/util-time.h b/src/util-time.h
index ef7ab98f..a3a5baf3 100644
--- a/src/util-time.h
+++ b/src/util-time.h
@@ -41,7 +41,7 @@ DECLARE_NEWTYPE(usec, uint64_t);
 static inline usec_t
 usec_from_millis(uint32_t millis)
 {
-	return usec_from_uint64_t(millis * 1000);
+	return usec_from_uint64_t(millis * 1000ULL);
 }
 
 static inline usec_t
@@ -101,13 +101,13 @@ us2ms_f(usec_t us)
 static inline usec_t
 usec_from_timeval(const struct timeval *tv)
 {
-	return usec_from_uint64_t(tv->tv_sec * 1000000 + tv->tv_usec);
+	return usec_from_uint64_t(tv->tv_sec * 1000000ULL + tv->tv_usec);
 }
 
 static inline usec_t
 usec_from_timespec(const struct timespec *tp)
 {
-	return usec_from_uint64_t(tp->tv_sec * 1000000 + tp->tv_nsec / 1000);
+	return usec_from_uint64_t(tp->tv_sec * 1000000ULL + tp->tv_nsec / 1000);
 }
 
 static inline usec_t