diff --git a/libc-test/semver/linux-riscv64gc.txt b/libc-test/semver/linux-riscv64gc.txt
index 01609e899a709..3f0f93a13ac13 100644
--- a/libc-test/semver/linux-riscv64gc.txt
+++ b/libc-test/semver/linux-riscv64gc.txt
@@ -80,3 +80,4 @@ TIOCSRS485
 flock64
 fsblkcnt64_t
 fsfilcnt64_t
+max_align_t
diff --git a/src/unix/linux_like/linux/gnu/b64/riscv64/mod.rs b/src/unix/linux_like/linux/gnu/b64/riscv64/mod.rs
index 3438a510d3bf9..cbb1502ebcc01 100644
--- a/src/unix/linux_like/linux/gnu/b64/riscv64/mod.rs
+++ b/src/unix/linux_like/linux/gnu/b64/riscv64/mod.rs
@@ -286,6 +286,11 @@ s_no_extra_traits! {
         pub __fcsr: c_uint,
         pub __glibc_reserved: [c_uint; 3],
     }
+
+    #[repr(align(16))]
+    pub struct max_align_t {
+        priv_: [f32; 8],
+    }
 }
 
 pub const POSIX_FADV_DONTNEED: c_int = 4;