diff --git a/tests/qemu-iotests/159 b/tests/qemu-iotests/159
index 825f05fab8b6cd0c3bd696cc7373954dbd07fb35..9b0e1ecc90db4718f94749b76c7d29c99f85fe32 100755
--- a/tests/qemu-iotests/159
+++ b/tests/qemu-iotests/159
@@ -40,6 +40,7 @@ trap "_cleanup; exit \$status" 0 1 2 3 15
 _supported_fmt generic
 _supported_proto file
 _supported_os Linux
+_unsupported_fmt luks
 
 TEST_SIZES="5 512 1024 1999 1K 64K 1M"
 
diff --git a/tests/qemu-iotests/170 b/tests/qemu-iotests/170
index 5b335dbc3e902d4236a7354649524bc5b8cc89d6..b79359fc4e4f68b9fdb8e1f2fdfce8761f8187d3 100755
--- a/tests/qemu-iotests/170
+++ b/tests/qemu-iotests/170
@@ -40,6 +40,7 @@ trap "_cleanup; exit \$status" 0 1 2 3 15
 _supported_fmt generic
 _supported_proto file
 _supported_os Linux
+_unsupported_fmt luks
 
 echo
 echo "== Creating image =="