diff --git a/gst-plugin-flv/src/flvdemux.rs b/gst-plugin-flv/src/flvdemux.rs
index df0c5a91..29e5646b 100644
--- a/gst-plugin-flv/src/flvdemux.rs
+++ b/gst-plugin-flv/src/flvdemux.rs
@@ -205,7 +205,7 @@ impl AudioFormat {
 
                     data.into_inner()
                 };
-                let header = gst::Buffer::from_vec(header).unwrap();
+                let header = gst::Buffer::from_mut_slice(header).unwrap();
 
                 let comment = {
                     let comment_size = 4 + 7 /* nothing */ + 4 + 1;
@@ -219,7 +219,7 @@ impl AudioFormat {
 
                     data.into_inner()
                 };
-                let comment = gst::Buffer::from_vec(comment).unwrap();
+                let comment = gst::Buffer::from_mut_slice(comment).unwrap();
 
                 Some(gst::Caps::new_simple(
                     "audio/x-speex",