diff --git a/.github/workflows/clippy_check.yml b/.github/workflows/clippy_check.yml
index e6cc2c3dd03..2ed7dcd5685 100644
--- a/.github/workflows/clippy_check.yml
+++ b/.github/workflows/clippy_check.yml
@@ -15,4 +15,4 @@ jobs:
         uses: actions-rs/clippy-check@v1.0.7
         with:
           token: ${{ github.token }}
-          args: --all-features
+          args: --all-features -- -D warnings
diff --git a/sway-core/src/semantic_analysis/namespace.rs b/sway-core/src/semantic_analysis/namespace.rs
index 8bfc69aeacb..7ac3e5c71f5 100644
--- a/sway-core/src/semantic_analysis/namespace.rs
+++ b/sway-core/src/semantic_analysis/namespace.rs
@@ -150,7 +150,7 @@ impl Namespace {
                 }
             }
         }
-        self.symbols.insert(name.clone(), item.clone());
+        self.symbols.insert(name, item);
         ok((), warnings, errors)
     }