diff --git a/contracts/libraries/helpers/Errors.sol b/contracts/libraries/helpers/Errors.sol
index 3f044b17..61f5aaf6 100644
--- a/contracts/libraries/helpers/Errors.sol
+++ b/contracts/libraries/helpers/Errors.sol
@@ -98,6 +98,8 @@ library Errors {
   string public constant LP_INCONSISTENT_PARAMS_LENGTH = '74';
   string public constant UL_INVALID_INDEX = '77';
   string public constant LP_NOT_CONTRACT = '78';
+  string public constant AT_STABLE_DEBT_OVERFLOW = '79';
+  string public constant AT_BURN_EXCEEDS_BALANCE = '80';
 
   enum CollateralManagerErrors {
     NO_ERROR,
diff --git a/contracts/libraries/logic/ReserveLogic.sol b/contracts/libraries/logic/ReserveLogic.sol
index 559c13d1..6774cd6e 100644
--- a/contracts/libraries/logic/ReserveLogic.sol
+++ b/contracts/libraries/logic/ReserveLogic.sol
@@ -247,9 +247,9 @@ library ReserveLogic {
       vars.avgStableRate,
       reserve.configuration.getReserveFactor()
     );
-    require(vars.newLiquidityRate < type(uint128).max, 'ReserveLogic: Liquidity rate overflow');
-    require(vars.newStableRate < type(uint128).max, 'ReserveLogic: Stable borrow rate overflow');
-    require(vars.newVariableRate < type(uint128).max, 'ReserveLogic: Variable borrow rate overflow');
+    require(vars.newLiquidityRate < type(uint128).max, Errors.RL_LIQUIDITY_RATE_OVERFLOW);
+    require(vars.newStableRate < type(uint128).max, Errors.RL_STABLE_BORROW_RATE_OVERFLOW);
+    require(vars.newVariableRate < type(uint128).max, Errors.RL_VARIABLE_BORROW_RATE_OVERFLOW);
 
     reserve.currentLiquidityRate = uint128(vars.newLiquidityRate);
     reserve.currentStableBorrowRate = uint128(vars.newStableRate);
diff --git a/contracts/tokenization/StableDebtToken.sol b/contracts/tokenization/StableDebtToken.sol
index e593c188..1184be79 100644
--- a/contracts/tokenization/StableDebtToken.sol
+++ b/contracts/tokenization/StableDebtToken.sol
@@ -5,6 +5,7 @@ import {DebtTokenBase} from './base/DebtTokenBase.sol';
 import {MathUtils} from '../libraries/math/MathUtils.sol';
 import {WadRayMath} from '../libraries/math/WadRayMath.sol';
 import {IStableDebtToken} from './interfaces/IStableDebtToken.sol';
+import {Errors} from '../libraries/helpers/Errors.sol';
 
 /**
  * @title contract StableDebtToken
@@ -122,7 +123,7 @@ contract StableDebtToken is IStableDebtToken, DebtTokenBase {
       .add(vars.amountInRay.rayMul(rate))
       .rayDiv(currentBalance.add(amount).wadToRay());
 
-    require(vars.newStableRate < type(uint128).max, 'Debt token: stable rate overflow');
+    require(vars.newStableRate < type(uint128).max, Errors.AT_STABLE_DEBT_OVERFLOW);
     _usersStableRate[onBehalfOf] = vars.newStableRate;
 
     //updating the user and supply timestamp
@@ -342,7 +343,7 @@ contract StableDebtToken is IStableDebtToken, DebtTokenBase {
     uint256 oldTotalSupply
   ) internal {
     uint256 oldAccountBalance = _balances[account];
-    _balances[account] = oldAccountBalance.sub(amount, 'ERC20: burn amount exceeds balance');
+    _balances[account] = oldAccountBalance.sub(amount, Errors.AT_BURN_EXCEEDS_BALANCE);
 
     if (address(_incentivesController) != address(0)) {
       _incentivesController.handleAction(account, oldTotalSupply, oldAccountBalance);