diff --git a/examples/mp4dump.rs b/examples/mp4dump.rs
index 6a97d9a..597bb70 100644
--- a/examples/mp4dump.rs
+++ b/examples/mp4dump.rs
@@ -56,7 +56,9 @@ fn get_boxes(file: File) -> Result<Vec<Box>> {
         if let Some(mehd) = &mvex.mehd {
             boxes.push(build_box(mehd));
         }
-        boxes.push(build_box(&mvex.trex));
+        for trex in &mvex.trex {
+            boxes.push(build_box(trex));
+        }
     }
 
     // trak.
diff --git a/src/mp4box/mvex.rs b/src/mp4box/mvex.rs
index 44a4f19..b0afe9a 100644
--- a/src/mp4box/mvex.rs
+++ b/src/mp4box/mvex.rs
@@ -93,7 +93,7 @@ impl<W: Write> WriteBox<&mut W> for MvexBox {
         if let Some(mehd) = &self.mehd {
             mehd.write_box(writer)?;
         }
-        for trex in self.trex {
+        for trex in &self.trex {
             trex.write_box(writer)?;
         }