diff --git a/cddl/cose-sign1-corim.cddl b/cddl/cose-sign1-corim.cddl
index cfa916e1..0e574015 100644
--- a/cddl/cose-sign1-corim.cddl
+++ b/cddl/cose-sign1-corim.cddl
@@ -1,6 +1,6 @@
 COSE-Sign1-corim = [
   protected: bstr .cbor protected-corim-header-map
   unprotected: unprotected-corim-header-map
-  payload: bstr .cbor tagged-corim-map
+  payload: bstr .cbor (tagged-corim-map / corim-map)
   signature: bstr
 ]