diff --git a/pkg/core/helper_test.go b/pkg/core/helper_test.go
index 460735c31..575f3d038 100644
--- a/pkg/core/helper_test.go
+++ b/pkg/core/helper_test.go
@@ -14,7 +14,6 @@ import (
 	"github.com/nspcc-dev/neo-go/pkg/core/storage"
 	"github.com/nspcc-dev/neo-go/pkg/core/transaction"
 	"github.com/nspcc-dev/neo-go/pkg/crypto/hash"
-	"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
 	"github.com/nspcc-dev/neo-go/pkg/internal/testchain"
 	"github.com/nspcc-dev/neo-go/pkg/internal/testserdes"
 	"github.com/nspcc-dev/neo-go/pkg/io"
@@ -141,13 +140,6 @@ func newDumbBlock() *block.Block {
 	}
 }
 
-func getInvocationScript(data []byte, priv *keys.PrivateKey) []byte {
-	signature := priv.Sign(data)
-	buf := io.NewBufBinWriter()
-	emit.Bytes(buf.BinWriter, signature)
-	return buf.Bytes()
-}
-
 // This function generates "../rpc/testdata/testblocks.acc" file which contains data
 // for RPC unit tests. It also is a nice integration test.
 // To generate new "../rpc/testdata/testblocks.acc", follow the steps: