diff --git a/libc-test/tests/cmsg.rs b/libc-test/tests/cmsg.rs
index bba658c498aa9..18b3a58b968b7 100644
--- a/libc-test/tests/cmsg.rs
+++ b/libc-test/tests/cmsg.rs
@@ -29,6 +29,7 @@ mod t {
     }
 
     #[test]
+    #[allow(unused_assignments)] // false-positive: https://github.com/rust-lang/rust/issues/147648
     fn test_cmsg_firsthdr() {
         let mut mhdr: msghdr = unsafe { mem::zeroed() };
         mhdr.msg_control = 0xdeadbeef as *mut c_void;