diff --git a/scst/src/scst_lib.c b/scst/src/scst_lib.c
index ca59eeaf4..8d0569fa0 100644
--- a/scst/src/scst_lib.c
+++ b/scst/src/scst_lib.c
@@ -950,6 +950,7 @@ go:
 
 	memset(buf, 0, len);
 	buf[0] = 0x7F; /* Peripheral qualifier 011b, Peripheral device type 1Fh */
+	buf[4] = len - 4;
 
 	TRACE_BUFFER("INQUIRY for not supported LUN set", buf, len);