diff --git a/classes/dm-verity-img.bbclass b/classes/dm-verity-img.bbclass
index 6faed5b..6ad0f75 100644
--- a/classes/dm-verity-img.bbclass
+++ b/classes/dm-verity-img.bbclass
@@ -68,13 +68,13 @@ python __anonymous() {
     image_fstypes = d.getVar('IMAGE_FSTYPES')
     pn = d.getVar('PN')
 
-    if verity_image != pn:
-        return # This doesn't concern this image
-
     if not verity_image or not verity_type:
         bb.warn('dm-verity-img class inherited but not used')
         return
 
+    if verity_image != pn:
+        return # This doesn't concern this image
+
     if len(verity_type.split()) is not 1:
         bb.fatal('DM_VERITY_IMAGE_TYPE must contain exactly one type')