diff --git a/src/util/channel_layout/iter.rs b/src/util/channel_layout/iter.rs
index ac4acf2..fc24cb5 100644
--- a/src/util/channel_layout/iter.rs
+++ b/src/util/channel_layout/iter.rs
@@ -15,6 +15,12 @@ impl ChannelLayoutIter {
     }
 }
 
+impl Default for ChannelLayoutIter {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl Iterator for ChannelLayoutIter {
     type Item = ChannelLayout<'static>;
 
diff --git a/src/util/channel_layout/mask.rs b/src/util/channel_layout/mask.rs
index 78c5702..d845c42 100644
--- a/src/util/channel_layout/mask.rs
+++ b/src/util/channel_layout/mask.rs
@@ -2,7 +2,7 @@ use crate::ffi::*;
 use libc::c_ulonglong;
 
 bitflags! {
-    #[derive(Eq, PartialEq, Copy, Clone)]
+    #[derive(Eq, PartialEq, Copy, Clone, Debug)]
     pub struct ChannelLayoutMask: c_ulonglong {
         const FRONT_LEFT            = AV_CH_FRONT_LEFT;
         const FRONT_RIGHT           = AV_CH_FRONT_RIGHT;