diff --git a/crates/ty_python_semantic/src/semantic_index/member.rs b/crates/ty_python_semantic/src/semantic_index/member.rs
index 51399ab6a7..8511c7b295 100644
--- a/crates/ty_python_semantic/src/semantic_index/member.rs
+++ b/crates/ty_python_semantic/src/semantic_index/member.rs
@@ -507,6 +507,7 @@ enum Segments {
 }
 
 static_assertions::assert_eq_size!(SmallSegments, u64);
+#[cfg(target_pointer_width = "64")]
 static_assertions::assert_eq_size!(Segments, [u64; 2]);
 
 impl Segments {