diff --git a/pkg/core/blockchain.go b/pkg/core/blockchain.go
index 15f5192a7..3b4f5b276 100644
--- a/pkg/core/blockchain.go
+++ b/pkg/core/blockchain.go
@@ -1331,8 +1331,8 @@ func (bc *Blockchain) GetScriptHashesForVerifyingClaim(t *transaction.Transactio
 
 	claim := t.Data.(*transaction.ClaimTX)
 	clGroups := make(map[util.Uint256][]*transaction.Input)
-	for _, in := range claim.Claims {
-		clGroups[in.PrevHash] = append(clGroups[in.PrevHash], in)
+	for i := range claim.Claims {
+		clGroups[claim.Claims[i].PrevHash] = append(clGroups[claim.Claims[i].PrevHash], &claim.Claims[i])
 	}
 	for group, inputs := range clGroups {
 		refTx, _, err := bc.dao.GetTransaction(group)
diff --git a/pkg/core/transaction/claim.go b/pkg/core/transaction/claim.go
index 423a4bc79..05f9b1a16 100644
--- a/pkg/core/transaction/claim.go
+++ b/pkg/core/transaction/claim.go
@@ -6,7 +6,7 @@ import (
 
 // ClaimTX represents a claim transaction.
 type ClaimTX struct {
-	Claims []*Input
+	Claims []Input
 }
 
 // DecodeBinary implements Serializable interface.