diff --git a/libc-test/build.rs b/libc-test/build.rs
index a53dcfebcc3e5..d5bf3ea61ba39 100644
--- a/libc-test/build.rs
+++ b/libc-test/build.rs
@@ -3480,7 +3480,9 @@ fn test_linux(target: &str) {
         (struct_ == "user_fpsimd_struct" && field == "vregs") ||
         // Linux >= 5.11 tweaked the `svm_zero` field of the `sockaddr_vm` struct.
         // https://github.com/torvalds/linux/commit/dc8eeef73b63ed8988224ba6b5ed19a615163a7f
-        (struct_ == "sockaddr_vm" && field == "svm_zero")
+        (struct_ == "sockaddr_vm" && field == "svm_zero") ||
+        // the `ifr_ifru` field is an anonymous union
+        (struct_ == "ifreq" && field == "ifr_ifru")
     });
 
     cfg.skip_roundtrip(move |s| match s {