diff --git a/src/cmd/build.rs b/src/cmd/build.rs
index ccc1d33dc279e8f54afbfdf6b4cb9f9335d90cbe..c10b48ba1fe17cb6dc0091dae5cdec6366f74ef2 100644
--- a/src/cmd/build.rs
+++ b/src/cmd/build.rs
@@ -550,7 +550,7 @@ fn optimize_wasm(
         "{}-opt.wasm",
         crate_metadata.contract_artifact_name
     ));
-    let _ = do_optimization(
+    do_optimization(
         crate_metadata.dest_wasm.as_os_str(),
         dest_optimized.as_os_str(),
         optimization_passes,
@@ -612,7 +612,7 @@ fn do_optimization(
         .as_path();
     log::info!("Path to wasm-opt executable: {}", wasm_opt_path.display());
 
-    let _ = check_wasm_opt_version_compatibility(wasm_opt_path)?;
+    check_wasm_opt_version_compatibility(wasm_opt_path)?;
 
     log::info!(
         "Optimization level passed to wasm-opt: {}",