diff --git a/ffmpeg-definitions.rkt b/ffmpeg-definitions.rkt
index 287ee23..f9fd7a7 100644
--- a/ffmpeg-definitions.rkt
+++ b/ffmpeg-definitions.rkt
@@ -268,7 +268,9 @@
   (_fun _AVChannelLayout-pointer -> _void))
 
 (define (ffmpeg-make-default-channel-layout channels)
-  (let ((p (malloc (ctype-sizeof _AVChannelLayout) 'atomic-interior)))
+  (let ((p (cast (malloc (ctype-sizeof _AVChannelLayout) 'atomic-interior)
+                 _pointer
+                 _AVChannelLayout-pointer)))
     (av_channel_layout_default p channels)
     p))
 
diff --git a/private/pcm-converter.rkt b/private/pcm-converter.rkt
index cfd6137..37d1a5c 100644
--- a/private/pcm-converter.rkt
+++ b/private/pcm-converter.rkt
@@ -1,8 +1,8 @@
 (module pcm-converter racket/base
 
   (require ffi/unsafe
-           "../ffmpeg-definitions.rkt"
-           "utils.rkt")
+           "utils.rkt"
+           "../ffmpeg-definitions.rkt")
 
   (provide pcm-conversion-needed?
            make-pcm-converter