diff --git a/contracts/BaseSynthetix.sol b/contracts/BaseSynthetix.sol
index f68178221..80400445a 100644
--- a/contracts/BaseSynthetix.sol
+++ b/contracts/BaseSynthetix.sol
@@ -425,6 +425,8 @@ contract BaseSynthetix is IERC20, ExternStateToken, MixinResolver, ISynthetix {
 
     /// @notice Allows an account to self-liquidate anytime its c-ratio is below the target issuance ratio.
     function liquidateSelf() external systemActive optionalProxy returns (bool) {
+        require(resolver.getAddress(CONTRACT_V3_LEGACYMARKET) == address(0), "Must liquidate using V3");
+
         // must store liquidated account address because below functions may attempt to transfer SNX which changes messageSender
         address liquidatedAccount = messageSender;
 
diff --git a/test/contracts/Liquidator.js b/test/contracts/Liquidator.js
index 61d831e62..3818d3d0e 100644
--- a/test/contracts/Liquidator.js
+++ b/test/contracts/Liquidator.js
@@ -318,6 +318,9 @@ contract('Liquidator', accounts => {
 					'Must liquidate using V3'
 				);
 			});
+			it('when liquidateSelf() is invoked, it reverts with must liquidate using V3', async () => {
+				await assert.revert(synthetix.liquidateSelf({ from: alice }), 'Must liquidate using V3');
+			});
 		});
 		describe('protected methods', () => {
 			describe('only internal contracts can call', () => {