diff --git a/sys/kern/kern_umtx.c b/sys/kern/kern_umtx.c
index 9562944bc7e4..2b7e92fc8af3 100644
--- a/sys/kern/kern_umtx.c
+++ b/sys/kern/kern_umtx.c
@@ -3291,8 +3291,8 @@ freebsd32_umtx_unlock(struct thread *td, struct freebsd32_umtx_unlock_args *uap)
 }
 
 struct timespec32 {
-	uint32_t tv_sec;
-	uint32_t tv_nsec;
+	int32_t tv_sec;
+	int32_t tv_nsec;
 };
 
 struct umtx_time32 {