diff --git a/crates/tinymist-query/src/syntax/expr.rs b/crates/tinymist-query/src/syntax/expr.rs
index 429bded1..d1fd8c17 100644
--- a/crates/tinymist-query/src/syntax/expr.rs
+++ b/crates/tinymist-query/src/syntax/expr.rs
@@ -1180,3 +1180,12 @@ fn extract_ref(step: Option<Expr>) -> (Option<Expr>, Option<Expr>) {
 fn none_expr() -> Expr {
     Expr::Type(Ty::Builtin(BuiltinTy::None))
 }
+
+#[cfg(test)]
+mod tests {
+    #[test]
+    fn test_expr_size() {
+        use super::*;
+        assert!(size_of::<Expr>() <= size_of::<usize>() * 2);
+    }
+}
diff --git a/crates/tinymist-query/src/ty/def.rs b/crates/tinymist-query/src/ty/def.rs
index 84a06851..96061d2b 100644
--- a/crates/tinymist-query/src/ty/def.rs
+++ b/crates/tinymist-query/src/ty/def.rs
@@ -1198,7 +1198,7 @@ mod tests {
     #[test]
     fn test_ty_size() {
         use super::*;
-        assert!(size_of::<Ty>() == 16);
+        assert!(size_of::<Ty>() <= size_of::<usize>() * 2);
     }
 
     #[test]