diff --git a/channels/chan_zap.c b/channels/chan_zap.c
index 0208f54f09..c2fad91d7a 100644
--- a/channels/chan_zap.c
+++ b/channels/chan_zap.c
@@ -4774,7 +4774,7 @@ static struct ast_frame  *zt_read(struct ast_channel *ast)
 	p->subs[index].f.samples = READ_SIZE;
 	p->subs[index].f.mallocd = 0;
 	p->subs[index].f.offset = AST_FRIENDLY_OFFSET;
-	p->subs[index].f.data = p->subs[index].buffer + AST_FRIENDLY_OFFSET/2;
+	p->subs[index].f.data = p->subs[index].buffer + AST_FRIENDLY_OFFSET / sizeof(p->subs[index].buffer[0]);
 #if 0
 	ast_log(LOG_DEBUG, "Read %d of voice on %s\n", p->subs[index].f.datalen, ast->name);
 #endif