diff --git a/sys/src/cmd/nusb/ptp/ptp.c b/sys/src/cmd/nusb/ptp/ptp.c
index 2b9ef459f..6581b28cc 100644
--- a/sys/src/cmd/nusb/ptp/ptp.c
+++ b/sys/src/cmd/nusb/ptp/ptp.c
@@ -45,7 +45,7 @@ struct Ptprpc
 	uchar	type[2];
 	uchar	code[2];
 	uchar	transid[4];
-	uchar	d[500];
+	uchar	d[1012];
 };
 
 struct Node