diff --git a/src/internals/iterator.rs b/src/internals/iterator.rs
index 1f31241..2dc8ff8 100644
--- a/src/internals/iterator.rs
+++ b/src/internals/iterator.rs
@@ -35,10 +35,54 @@ pub trait MemoryBlockIterator {
     fn next(&mut self) -> Option<MemoryBlock>;
 }
 
+impl<T> MemoryBlockIterator for Box<T>
+where
+    T: MemoryBlockIterator,
+{
+    fn first(&mut self) -> Option<MemoryBlock> {
+        (**self).first()
+    }
+
+    fn next(&mut self) -> Option<MemoryBlock> {
+        (**self).next()
+    }
+}
+
+impl<T> MemoryBlockIterator for &mut T
+where
+    T: MemoryBlockIterator,
+{
+    fn first(&mut self) -> Option<MemoryBlock> {
+        (**self).first()
+    }
+
+    fn next(&mut self) -> Option<MemoryBlock> {
+        (**self).next()
+    }
+}
+
 pub trait MemoryBlockIteratorSized: MemoryBlockIterator {
     fn file_size(&mut self) -> u64;
 }
 
+impl<T> MemoryBlockIteratorSized for Box<T>
+where
+    T: MemoryBlockIteratorSized,
+{
+    fn file_size(&mut self) -> u64 {
+        (**self).file_size()
+    }
+}
+
+impl<T> MemoryBlockIteratorSized for &mut T
+where
+    T: MemoryBlockIteratorSized,
+{
+    fn file_size(&mut self) -> u64 {
+        (**self).file_size()
+    }
+}
+
 #[derive(Debug)]
 pub struct WrapperMemoryBlockIterator<T> {
     iter: T,