diff --git a/ref-tests/tests/integration.rs b/ref-tests/tests/integration.rs
index b3d4c472..ed38936a 100644
--- a/ref-tests/tests/integration.rs
+++ b/ref-tests/tests/integration.rs
@@ -260,7 +260,7 @@ fn wallet_canister_create_and_install() {
 
         let args = Argument::from_candid((install_config,));
 
-        () = wallet
+        let _: () = wallet
             .call64(Principal::management_canister(), "install_code", args, 0)
             .call_and_wait()
             .await?;