diff --git a/src/interface/referral.cairo b/src/interface/referral.cairo
index 9fe8748..cc96c4c 100644
--- a/src/interface/referral.cairo
+++ b/src/interface/referral.cairo
@@ -6,6 +6,7 @@ trait IReferral<TContractState> {
         self: @TContractState,
         amount: u256,
         sponsor_addr: ContractAddress,
-        sponsored_addr: ContractAddress
+        sponsored_addr: ContractAddress,
+        erc20_addr: ContractAddress,
     );
 }
diff --git a/src/naming/internal.cairo b/src/naming/internal.cairo
index ee374a0..573cde2 100644
--- a/src/naming/internal.cairo
+++ b/src/naming/internal.cairo
@@ -106,7 +106,7 @@ impl InternalImpl of InternalTrait {
         // add sponsor commission if eligible
         if sponsor.into() != 0 {
             IReferralDispatcher { contract_address: self._referral_contract.read() }
-                .add_commission(discounted_price, sponsor, sponsored_addr: get_caller_address());
+                .add_commission(discounted_price, sponsor, sponsored_addr: get_caller_address(), erc20_addr: erc20);
         }
     }