diff --git a/libc-test/build.rs b/libc-test/build.rs
index fb008fae..65d2f099 100644
--- a/libc-test/build.rs
+++ b/libc-test/build.rs
@@ -3327,7 +3327,9 @@ fn test_linux(target: &str) {
             && ((x86_64 || i686 || arm || riscv64) && gnu || x86_64_gnux32)
         ) ||
         // the `u` field is in fact an anonymous union
-        (gnu && struct_ == "ptrace_syscall_info" && (field == "u" || field == "pad"))
+        (gnu && struct_ == "ptrace_syscall_info" && (field == "u" || field == "pad")) ||
+        // the vregs field is a `__uint128_t` C's type.
+        (struct_ == "user_fpsimd_struct" && field == "vregs")
     });
 
     cfg.skip_roundtrip(move |s| match s {
diff --git a/src/unix/linux_like/linux/gnu/b64/aarch64/align.rs b/src/unix/linux_like/linux/gnu/b64/aarch64/align.rs
index 154c2c54..c8fc9a20 100644
--- a/src/unix/linux_like/linux/gnu/b64/aarch64/align.rs
+++ b/src/unix/linux_like/linux/gnu/b64/aarch64/align.rs
@@ -26,4 +26,12 @@ s! {
         // auto-derive traits like Debug
         __reserved: [[u64; 32]; 16],
     }
+
+    #[repr(align(16))]
+    pub struct user_fpsimd_struct {
+        pub vregs: [[u64; 2]; 32],
+        pub fpsr: ::c_uint,
+        pub fpcr: ::c_uint,
+    }
+
 }