diff --git a/tinyplay.c b/tinyplay.c
index 2251cfe..4d257e7 100644
--- a/tinyplay.c
+++ b/tinyplay.c
@@ -155,7 +155,7 @@ void play_sample(FILE *file, unsigned int card, unsigned int device, unsigned in
         return;
     }
 
-    size = pcm_get_buffer_size(pcm);
+    size = pcm_frames_to_bytes(pcm, pcm_get_buffer_size(pcm));
     buffer = malloc(size);
     if (!buffer) {
         fprintf(stderr, "Unable to allocate %d bytes\n", size);