diff --git a/lib/libc/time/difftime.c b/lib/libc/time/difftime.c
index 6d0140088b4..e62d5295469 100644
--- a/lib/libc/time/difftime.c
+++ b/lib/libc/time/difftime.c
@@ -1,10 +1,10 @@
-/*	$OpenBSD: difftime.c,v 1.13 2025/05/21 01:27:29 millert Exp $ */
+/*	$OpenBSD: difftime.c,v 1.14 2026/04/23 01:08:47 millert Exp $ */
 /* This file is placed in the public domain by Matthew Dempsky. */
 
 #include "private.h"
 
-#define HI(t) ((double)(t & 0xffffffff00000000LL))
-#define LO(t) ((double)(t & 0x00000000ffffffffLL))
+#define HI(t) ((double)(time_t)(t & 0xffffffff00000000LL))
+#define LO(t) ((double)(time_t)(t & 0x00000000ffffffffLL))
 
 double __pure
 difftime(time_t t1, time_t t0)