diff --git a/tests/qemu-iotests/194 b/tests/qemu-iotests/194
index 6449b9b64a..8d973b440f 100755
--- a/tests/qemu-iotests/194
+++ b/tests/qemu-iotests/194
@@ -21,6 +21,7 @@
 
 import iotests
 
+iotests.verify_image_format(unsupported_fmts=['luks'])
 iotests.verify_platform(['linux'])
 
 with iotests.FilePath('source.img') as source_img_path, \
diff --git a/tests/qemu-iotests/iotests.py b/tests/qemu-iotests/iotests.py
index 07fa1626a0..1af117e37d 100644
--- a/tests/qemu-iotests/iotests.py
+++ b/tests/qemu-iotests/iotests.py
@@ -421,9 +421,11 @@ def notrun(reason):
     print '%s not run: %s' % (seq, reason)
     sys.exit(0)
 
-def verify_image_format(supported_fmts=[]):
+def verify_image_format(supported_fmts=[], unsupported_fmts=[]):
     if supported_fmts and (imgfmt not in supported_fmts):
         notrun('not suitable for this image format: %s' % imgfmt)
+    if unsupported_fmts and (imgfmt in unsupported_fmts):
+        notrun('not suitable for this image format: %s' % imgfmt)
 
 def verify_platform(supported_oses=['linux']):
     if True not in [sys.platform.startswith(x) for x in supported_oses]: