diff --git a/rust/src/zstd_compress.rs b/rust/src/zstd_compress.rs
index 39026cd4b..85cd8327c 100644
--- a/rust/src/zstd_compress.rs
+++ b/rust/src/zstd_compress.rs
@@ -415,7 +415,13 @@ const _: () = {
             output_pos_before
         ) == 7 * size_of::<usize>()
     );
-    assert!(size_of::<ZSTD_rust_compressStream2MTLoopPolicyState>() == 8 * size_of::<usize>());
+    assert!(
+        size_of::<ZSTD_rust_compressStream2MTLoopPolicyState>()
+            == offset_of!(
+                ZSTD_rust_compressStream2MTLoopPolicyState,
+                output_pos_before
+            ) + size_of::<usize>()
+    );
 };
 
 #[inline]