diff --git a/src/interpreter/instructions/mod.rs b/src/interpreter/instructions/mod.rs
index e38dcf3..183e0dc 100644
--- a/src/interpreter/instructions/mod.rs
+++ b/src/interpreter/instructions/mod.rs
@@ -54,7 +54,7 @@ pub(crate) mod tests {
 
     impl wasm::structures::LocalImport for LocalImport {
         fn inputs_cardinality(&self) -> usize {
-            self.inputs.len() as usize
+            self.inputs.len()
         }
 
         fn outputs_cardinality(&self) -> usize {
@@ -82,7 +82,7 @@ pub(crate) mod tests {
     impl Deref for MemoryView {
         type Target = [Cell<u8>];
 
-        fn deref(&self) -> &[Cell<u8>] {
+        fn deref(&self) -> &Self::Target {
             self.0.as_slice()
         }
     }
diff --git a/src/interpreter/wasm/structures.rs b/src/interpreter/wasm/structures.rs
index eb0a511..a38511c 100644
--- a/src/interpreter/wasm/structures.rs
+++ b/src/interpreter/wasm/structures.rs
@@ -125,7 +125,7 @@ impl MemoryView for EmptyMemoryView {}
 impl Deref for EmptyMemoryView {
     type Target = [Cell<u8>];
 
-    fn deref(&self) -> &[Cell<u8>] {
+    fn deref(&self) -> &Self::Target {
         &[]
     }
 }