diff --git a/contracts/burners/CurveLPBurner.vy b/contracts/burners/CurveLPBurner.vy
index c410b56c..88a91bf7 100644
--- a/contracts/burners/CurveLPBurner.vy
+++ b/contracts/burners/CurveLPBurner.vy
@@ -63,6 +63,7 @@ def __init__(_receiver: address, _recovery: address, _owner: address, _emergency
 
 
 @external
+@nonreentrant("lock")
 def burn(_coin: address) -> bool:
     """
     @notice Convert `_coin` by removing liquidity and send to receiver
diff --git a/contracts/burners/MUSDBurner.vy b/contracts/burners/MUSDBurner.vy
index 5a2ab374..316f54ff 100644
--- a/contracts/burners/MUSDBurner.vy
+++ b/contracts/burners/MUSDBurner.vy
@@ -52,6 +52,7 @@ def __init__(_receiver: address, _recovery: address, _owner: address, _emergency
 
 
 @external
+@nonreentrant("lock")
 def burn(_coin: address) -> bool:
     """
     @notice Convert `_coin` to USDC by withdrawing