diff --git a/solidity/core/interfaces/IValidatorManager.sol b/solidity/core/interfaces/IValidatorManager.sol
deleted file mode 100644
index 370e4f7e4..000000000
--- a/solidity/core/interfaces/IValidatorManager.sol
+++ /dev/null
@@ -1,11 +0,0 @@
-// SPDX-License-Identifier: MIT OR Apache-2.0
-pragma solidity >=0.6.11;
-
-interface IValidatorManager {
-    function isValidatorSignature(
-        uint32 _domain,
-        bytes32 _root,
-        uint256 _index,
-        bytes calldata _signature
-    ) external view returns (bool);
-}