diff --git a/lib/std/Io/net.zig b/lib/std/Io/net.zig
index 4b80d35a016e94a5580d3eae95106ee62e03a396..d128f2d2b37f0f8383e72953c0e345e0a0d6f7e9 100644
--- a/lib/std/Io/net.zig
+++ b/lib/std/Io/net.zig
@@ -1528,7 +1528,7 @@ pub const cmsg = struct {
         control: []align(cmsg_align) u8,
 
         pub const Message = struct {
-            header: *cmsghdr,
+            header: *align(cmsg_align) cmsghdr,
             data: []align(cmsg_align) u8,
         };