diff --git a/lustre/tests/cfg/lmv.sh b/lustre/tests/cfg/lmv.sh
index 8f96af36819742d4d9db36b1528702acca5a03e9..e7ea4d1df033d700a5feaefae5c11a32728c7ac0 100644
--- a/lustre/tests/cfg/lmv.sh
+++ b/lustre/tests/cfg/lmv.sh
@@ -21,6 +21,7 @@ STRIPE_BYTES=${STRIPE_BYTES:-1048576}
 STRIPES_PER_OBJ=${STRIPES_PER_OBJ:-$((OSTCOUNT -1))}
 TIMEOUT=${TIMEOUT:-20}
 PTLDEBUG=${PTLDEBUG:-0x33f0404}
+DEBUG_SIZE=${DEBUG_SIZE:-10}
 SUBSYSTEM=${SUBSYSTEM:-0xffb7e3ff}
 
 TMP=${TMP:-/tmp}