diff --git a/lib/api/src/externals/memory.rs b/lib/api/src/externals/memory.rs
index 78862d5dd..79d2ff2aa 100644
--- a/lib/api/src/externals/memory.rs
+++ b/lib/api/src/externals/memory.rs
@@ -153,7 +153,7 @@ impl Memory {
             return None;
         }
         self.try_clone(&store)
-            .and_then(|mut memory| memory.duplicate().ok())
+            .and_then(|memory| memory.duplicate().ok())
             .map(|new_memory| Self::new_from_existing(new_store, new_memory.into()))
     }