diff --git a/scripts/zconfig.sh b/scripts/zconfig.sh
index 75e37d0de275..d1e796f17366 100755
--- a/scripts/zconfig.sh
+++ b/scripts/zconfig.sh
@@ -194,7 +194,7 @@ test_3() {
 	${ZFS} create -V 100M ${FULL_ZVOL_NAME} || fail 3
 	label /dev/zvol/${FULL_ZVOL_NAME} msdos || fail 4
 	partition /dev/zvol/${FULL_ZVOL_NAME} primary 1% 50% || fail 4
-	partition /dev/zvol/${FULL_ZVOL_NAME} primary 50% 100% || fail 4
+	partition /dev/zvol/${FULL_ZVOL_NAME} primary 51% -1 || fail 4
 	${ZFS} snapshot ${FULL_SNAP_NAME} || fail 5
 	${ZFS} clone ${FULL_SNAP_NAME} ${FULL_CLONE_NAME} || fail 6
 
@@ -247,7 +247,7 @@ test_4() {
 	${ZFS} create -V 100M ${FULL_ZVOL_NAME} || fail 3
 	label /dev/zvol/${FULL_ZVOL_NAME} msdos || fail 4
 	partition /dev/zvol/${FULL_ZVOL_NAME} primary 1% 50% || fail 4
-	partition /dev/zvol/${FULL_ZVOL_NAME} primary 50% 100% || fail 4
+	partition /dev/zvol/${FULL_ZVOL_NAME} primary 51% -1 || fail 4
 	${ZFS} snapshot ${FULL_SNAP_NAME} || fail 5
 	${ZFS} clone ${FULL_SNAP_NAME} ${FULL_CLONE_NAME} || fail 6