diff --git a/lib/clif-backend/src/code.rs b/lib/clif-backend/src/code.rs
index 303070282..3a4b48016 100644
--- a/lib/clif-backend/src/code.rs
+++ b/lib/clif-backend/src/code.rs
@@ -115,7 +115,7 @@ impl ModuleCodeGenerator<CraneliftFunctionCodeGenerator, Caller, CodegenError>
         // `environ`. The callback functions may need to insert things in the entry block.
         builder.ensure_inserted_ebb();
 
-        let num_params = declare_wasm_parameters(&mut builder, entry_block);
+        declare_wasm_parameters(&mut builder, entry_block);
 
         // Set up the translation state with a single pushed control block representing the whole
         // function and its return values.
diff --git a/lib/clif-backend/src/lib.rs b/lib/clif-backend/src/lib.rs
index 82f67a39d..0ae4e9a59 100644
--- a/lib/clif-backend/src/lib.rs
+++ b/lib/clif-backend/src/lib.rs
@@ -1,4 +1,4 @@
-#![deny(unused_unsafe, unreachable_patterns)]
+#![deny(unused_imports, unused_variables, unused_unsafe, unreachable_patterns)]
 
 mod cache;
 mod code;