diff --git a/scripts/bb-test-zfstests.sh b/scripts/bb-test-zfstests.sh
index 36112d5..3a58e43 100644
--- a/scripts/bb-test-zfstests.sh
+++ b/scripts/bb-test-zfstests.sh
@@ -41,7 +41,7 @@ DEFAULT_ZFSTESTS_DISKS=${DEFAULT_ZFSTESTS_DISKS:-""}
 
 TEST_ZFSTESTS_DIR=${TEST_ZFSTESTS_DIR:-"/mnt/"}
 TEST_ZFSTESTS_DISKS=${TEST_ZFSTESTS_DISKS:-"$DEFAULT_ZFSTESTS_DISKS"}
-TEST_ZFSTESTS_DISKSIZE=${TEST_ZFSTESTS_SIZE:-"4G"}
+TEST_ZFSTESTS_DISKSIZE=${TEST_ZFSTESTS_SIZE:-"2G"}
 TEST_ZFSTESTS_OPTIONS=${TEST_ZFSTESTS_OPTIONS:-"-vx"}
 TEST_ZFSTESTS_RUNFILE=${TEST_ZFSTESTS_RUNFILE:-"$DEFAULT_ZFSTESTS_RUNFILE"}