diff --git a/contracts/interfaces/IAToken.sol b/contracts/interfaces/IAToken.sol
index 3a6ac663..cf0ea261 100644
--- a/contracts/interfaces/IAToken.sol
+++ b/contracts/interfaces/IAToken.sol
@@ -99,4 +99,9 @@ interface IAToken is IERC20, IScaledBalanceToken, IInitializableAToken {
    * @dev Returns the address of the incentives controller contract
    **/
   function getIncentivesController() external view returns (IAaveIncentivesController);
+
+  /**
+   * @dev Returns the address of the underlying asset of this aToken (E.g. WETH for aWETH)
+   **/
+  function UNDERLYING_ASSET_ADDRESS() external view returns (address);
 }