diff --git a/apps/plugins/pdbox/PDa/src/d_soundfile.c b/apps/plugins/pdbox/PDa/src/d_soundfile.c
index 67a80c9d3a..a23192319d 100644
--- a/apps/plugins/pdbox/PDa/src/d_soundfile.c
+++ b/apps/plugins/pdbox/PDa/src/d_soundfile.c
@@ -1129,7 +1129,7 @@ static void soundfiler_read(t_soundfiler *x, t_symbol *s,
     	int thisread = finalsize - itemsread;
     	thisread = (thisread > bufframes ? bufframes : thisread);
 #ifdef ROCKBOX
-        nitems = read(fp, sampbuf, thisread * bytespersamp * channels) / bytespersamp;
+        nitems = read(fp, sampbuf, thisread * bytespersamp * channels) / (bytespersamp * channels);
 #else
     	nitems = fread(sampbuf, channels * bytespersamp, thisread, fp);
 #endif