diff --git a/src/publication/publication.cairo b/src/publication/publication.cairo
index 135f5de..358035b 100644
--- a/src/publication/publication.cairo
+++ b/src/publication/publication.cairo
@@ -119,7 +119,7 @@ pub mod Publications {
 
         fn comment(
             ref self: ContractState,
-            referencePubParams: ReferencePubParams,
+            mut referencePubParams: ReferencePubParams,
             profile_address: ContractAddress
         ) -> u256 {
             let pubIdAssigned = self