diff --git a/installsystems/image.py b/installsystems/image.py
index 502f24c4827602d38a4b23bd7bba661f80e8ec3f..15b1b2b8b6d338d00066b64bf864e84852eb14f1 100644
--- a/installsystems/image.py
+++ b/installsystems/image.py
@@ -662,8 +662,8 @@ class Payload(object):
             dest = os.path.join(dest, self.name)
         # check validity of dest
         if os.path.exists(dest):
-            if not os.path.isfile(dest):
-                raise Exception("Destination %s is not a file" % dest)
+            if os.path.isdir(dest):
+                raise Exception("Destination %s is a directory" % dest)
             if not force:
                 raise Exception("File %s already exists" % dest)
         # opening destination