diff --git a/src/child/ChildERC20Bridge.sol b/src/child/ChildERC20Bridge.sol
index a603ac2a..48562440 100644
--- a/src/child/ChildERC20Bridge.sol
+++ b/src/child/ChildERC20Bridge.sol
@@ -67,7 +67,13 @@ contract ChildERC20Bridge is
     /**
      * @notice Fallback function on recieving native IMX.
      */
-    receive() external payable {}
+    receive() external payable {
+        // Revert if sender if not the wIMX token
+        // Or the wIMXToken is not set (contract not initialized)
+        if (msg.sender != wIMXToken || wIMXToken == address(0)) {
+            revert NonWrappedNativeTransfer();
+        }
+    }
 
     /**
      * @notice Initialization function for ChildERC20Bridge.
diff --git a/src/interfaces/child/IChildERC20Bridge.sol b/src/interfaces/child/IChildERC20Bridge.sol
index 729c9ddf..c17e8c5c 100644
--- a/src/interfaces/child/IChildERC20Bridge.sol
+++ b/src/interfaces/child/IChildERC20Bridge.sol
@@ -158,4 +158,6 @@ interface IChildERC20BridgeErrors {
     error TransferWIMXFailed();
     /// @notice Error when token balance invariant check fails.
     error BalanceInvariantCheckFailed(uint256 actualBalance, uint256 expectedBalance);
+    /// @notice Error when native transfer is sent to contract from non wrapped-token address.
+    error NonWrappedNativeTransfer();
 }
diff --git a/src/interfaces/root/IRootERC20Bridge.sol b/src/interfaces/root/IRootERC20Bridge.sol
index 2f29a6fa..912cbddf 100644
--- a/src/interfaces/root/IRootERC20Bridge.sol
+++ b/src/interfaces/root/IRootERC20Bridge.sol
@@ -125,4 +125,6 @@ interface IRootERC20BridgeErrors {
     error ImxDepositLimitExceeded();
     /// @notice Error when the IMX deposit limit is set below the amount of IMX already deposited
     error ImxDepositLimitTooLow();
+    /// @notice Error when native transfer is sent to contract from non wrapped-token address.
+    error NonWrappedNativeTransfer();
 }
diff --git a/src/root/RootERC20Bridge.sol b/src/root/RootERC20Bridge.sol
index 56fdd3c1..339e7f2b 100644
--- a/src/root/RootERC20Bridge.sol
+++ b/src/root/RootERC20Bridge.sol
@@ -168,7 +168,13 @@ contract RootERC20Bridge is
     /**
      * @dev method to receive the ETH back from the WETH contract when it is unwrapped
      */
-    receive() external payable {}
+    receive() external payable {
+        // Revert if sender if not the wIMX token
+        // Or the wIMXToken is not set (contract not initialized)
+        if (msg.sender != rootWETHToken || rootWETHToken == address(0)) {
+            revert NonWrappedNativeTransfer();
+        }
+    }
 
     /**
      * @inheritdoc IRootERC20Bridge
diff --git a/test/unit/child/ChildERC20Bridge.t.sol b/test/unit/child/ChildERC20Bridge.t.sol
index 5eeae329..91a2593d 100644
--- a/test/unit/child/ChildERC20Bridge.t.sol
+++ b/test/unit/child/ChildERC20Bridge.t.sol
@@ -62,6 +62,11 @@ contract ChildERC20BridgeUnitTest is Test, IChildERC20BridgeEvents, IChildERC20B
         assertFalse(address(childBridge.childETHToken()).code.length == 0, "childETHToken contract empty");
     }
 
+    function test_RevertIfNativeTransferIsFromNonWIMX() public {
+        vm.expectRevert(NonWrappedNativeTransfer.selector);
+        payable(childBridge).transfer(1);
+    }
+
     function test_RevertIfInitializeTwice() public {
         IChildERC20Bridge.InitializationRoles memory roles = IChildERC20Bridge.InitializationRoles({
             defaultAdmin: address(this),
diff --git a/test/unit/root/RootERC20Bridge.t.sol b/test/unit/root/RootERC20Bridge.t.sol
index a2788f18..fd85608d 100644
--- a/test/unit/root/RootERC20Bridge.t.sol
+++ b/test/unit/root/RootERC20Bridge.t.sol
@@ -87,6 +87,11 @@ contract RootERC20BridgeUnitTest is Test, IRootERC20BridgeEvents, IRootERC20Brid
         assertEq(rootBridge.rootWETHToken(), WRAPPED_ETH, "rootWETHToken not set");
     }
 
+    function test_RevertIfNativeTransferIsFromNonWETH() public {
+        vm.expectRevert(NonWrappedNativeTransfer.selector);
+        payable(rootBridge).transfer(1);
+    }
+
     function test_RevertIfInitializeTwice() public {
         IRootERC20Bridge.InitializationRoles memory roles = IRootERC20Bridge.InitializationRoles({
             defaultAdmin: address(this),