diff --git a/init.c b/init.c
index 2d8f1bbc..cba7fc23 100644
--- a/init.c
+++ b/init.c
@@ -71,7 +71,7 @@ mt76_write_mac_initvals(struct mt76_dev *dev)
 		{ MT_PBF_CFG,			0x1efebcff },
 		{ MT_FCE_PSE_CTRL,		0x00000001 },
 		{ MT_MAC_SYS_CTRL,		0x0000000c },
-		{ MT_MAX_LEN_CFG,		0x003e3fff },
+		{ MT_MAX_LEN_CFG,		0x003e3f00 },
 		{ MT_AMPDU_MAX_LEN_20M1S,	0xaaa99887 },
 		{ MT_AMPDU_MAX_LEN_20M2S,	0x000000aa },
 		{ MT_XIFS_TIME_CFG,		0x33a40d0a },