diff --git a/crates/env/src/engine/on_chain/ext.rs b/crates/env/src/engine/on_chain/ext.rs
index 1d5e923437..d194ec0212 100644
--- a/crates/env/src/engine/on_chain/ext.rs
+++ b/crates/env/src/engine/on_chain/ext.rs
@@ -350,7 +350,7 @@ mod sys {
         );
 
         pub fn seal_rent_status(
-            at_refcount: u32,
+            at_refcount: core::num::NonZeroU32,
             output_ptr: Ptr32Mut<[u8]>,
             output_len_ptr: Ptr32Mut<u32>,
         );