diff --git a/src/array/mod.rs b/src/array/mod.rs
index 412809038e..14c1b97b34 100644
--- a/src/array/mod.rs
+++ b/src/array/mod.rs
@@ -217,6 +217,10 @@ impl MutableArray for Box<dyn MutableArray> {
     fn shrink_to_fit(&mut self) {
         self.as_mut().shrink_to_fit();
     }
+
+    fn reserve(&mut self, additional: usize) {
+        self.as_mut().reserve(additional);
+    }
 }
 
 macro_rules! general_dyn {