diff --git a/starknet/src/authenticators/eth_tx.cairo b/starknet/src/authenticators/eth_tx.cairo
index b651383a..53b4a2ea 100644
--- a/starknet/src/authenticators/eth_tx.cairo
+++ b/starknet/src/authenticators/eth_tx.cairo
@@ -163,7 +163,7 @@ mod EthTxAuthenticator {
 
     fn consume_commit(ref self: ContractState, hash: felt252, sender_address: EthAddress) {
         let committer_address = self._commits.read(hash);
-        assert(committer_address.is_zero(), 'Commit not found');
+        assert(!committer_address.is_zero(), 'Commit not found');
         assert(committer_address == sender_address, 'Invalid sender address');
         // Delete the commit to prevent replay attacks.
         self._commits.write(hash, Zeroable::zero());