diff --git a/src/libraries/Errors.sol b/src/libraries/Errors.sol
index f7a849f0..a2628daf 100644
--- a/src/libraries/Errors.sol
+++ b/src/libraries/Errors.sol
@@ -35,6 +35,7 @@ library Errors {
     error INVALID_DEBT_POSITION_ID(uint256 debtPositionId);
     error INVALID_CREDIT_POSITION_ID(uint256 creditPositionId);
     error INVALID_LENDER(address account);
+    error INVALID_BORROWER(address account);
     error INVALID_LOAN_OFFER(address lender);
     error INVALID_BORROW_OFFER(address borrower);
 
diff --git a/src/libraries/actions/Repay.sol b/src/libraries/actions/Repay.sol
index 8f6c7db5..6ed5db50 100644
--- a/src/libraries/actions/Repay.sol
+++ b/src/libraries/actions/Repay.sol
@@ -13,6 +13,7 @@ import {Events} from "@src/libraries/Events.sol";
 
 struct RepayParams {
     uint256 debtPositionId;
+    address borrower;
 }
 
 /// @title Repay
@@ -36,6 +37,11 @@ library Repay {
             revert Errors.LOAN_ALREADY_REPAID(params.debtPositionId);
         }
 
+        // validate borrower
+        if (state.getDebtPosition(params.debtPositionId).borrower != params.borrower) {
+            revert Errors.INVALID_BORROWER(params.borrower);
+        }
+
         // validate msg.sender
         // N/A
     }