diff --git a/contracts/utils.go b/contracts/utils.go
index 961ea1a61a..17e108ee64 100644
--- a/contracts/utils.go
+++ b/contracts/utils.go
@@ -556,7 +556,7 @@ func Decrypt(key []byte, cryptoText string) string {
 	// XORKeyStream can work in-place if the two arguments are the same.
 	stream.XORKeyStream(ciphertext, ciphertext)
 
-	return fmt.Sprintf("%s", ciphertext)
+	return string(ciphertext[:])
 }
 
 // Generate random string.