diff --git a/src/rtl_sdr_fm.cpp b/src/rtl_sdr_fm.cpp
index 0d00207..ad4b267 100644
--- a/src/rtl_sdr_fm.cpp
+++ b/src/rtl_sdr_fm.cpp
@@ -766,7 +766,7 @@ static void rtlsdr_callback(unsigned char *buf, uint32_t len, void *ctx)
 static void *dongle_thread_fn(void *arg)
 {
 	struct dongle_state *s = static_cast<dongle_state*>(arg);
-	rtlsdr_read_async(s->dev, rtlsdr_callback, s, 0, s->buf_len);
+	rtlsdr_read_async(s->dev, rtlsdr_callback, s, 16, s->buf_len);
 	return 0;
 }