diff --git a/aplay/aplay.c b/aplay/aplay.c
index 3428150..c8b79b6 100644
--- a/aplay/aplay.c
+++ b/aplay/aplay.c
@@ -53,10 +53,10 @@
 
 /* global data */
 
-static ssize_t (*readi_func)(snd_pcm_t *handle, void *buffer, size_t size);
-static ssize_t (*writei_func)(snd_pcm_t *handle, const void *buffer, size_t size);
-static ssize_t (*readn_func)(snd_pcm_t *handle, void **bufs, size_t size);
-static ssize_t (*writen_func)(snd_pcm_t *handle, void **bufs, size_t size);
+static snd_pcm_sframes_t (*readi_func)(snd_pcm_t *handle, void *buffer, snd_pcm_uframes_t size);
+static snd_pcm_sframes_t (*writei_func)(snd_pcm_t *handle, const void *buffer, snd_pcm_uframes_t size);
+static snd_pcm_sframes_t (*readn_func)(snd_pcm_t *handle, void **bufs, snd_pcm_uframes_t size);
+static snd_pcm_sframes_t (*writen_func)(snd_pcm_t *handle, void **bufs, snd_pcm_uframes_t size);
 
 static char *command;
 static snd_pcm_t *handle;