diff --git a/time.zig b/time.zig
index 40f83ae7154a3800bacef903d657b1f324952438..b154c49dd609afdc51c2d6291f5af46c0bfecc25 100644
--- a/time.zig
+++ b/time.zig
@@ -235,8 +235,8 @@ pub const DateTime = struct {
 
     pub fn to_timespec(self: DateTime) sys.struct_timespec {
         return .{
-            .sec = self.toUnix(),
-            .nsec = self.ms * ns_per_ms,
+            .sec = @intCast(self.toUnix()),
+            .nsec = @as(isize, self.ms) * ns_per_ms,
         };
     }