diff --git a/src/RegistryCoordinator.sol b/src/RegistryCoordinator.sol
index a93132dd..8f79cce4 100644
--- a/src/RegistryCoordinator.sol
+++ b/src/RegistryCoordinator.sol
@@ -62,6 +62,7 @@ contract RegistryCoordinator is RegistryCoordinatorStorage {
         SignatureWithSaltAndExpiry memory operatorSignature
     ) external onlyWhenNotPaused(PAUSED_REGISTER_OPERATOR) {
         require(!isM2QuorumRegistrationDisabled, M2QuorumRegistrationIsDisabled());
+        require(quorumNumbers.orderedBytesArrayToBitmap().isSubsetOf(m2QuorumBitmap), OnlyM2QuorumsAllowed());
         
         // Check if the operator has registered before
         bool operatorRegisteredBefore = _operatorInfo[msg.sender].status == OperatorStatus.REGISTERED;
@@ -91,7 +92,8 @@ contract RegistryCoordinator is RegistryCoordinatorStorage {
         SignatureWithSaltAndExpiry memory operatorSignature
     ) external onlyWhenNotPaused(PAUSED_REGISTER_OPERATOR) {
         require(!isM2QuorumRegistrationDisabled, M2QuorumRegistrationIsDisabled());
-
+        require(quorumNumbers.orderedBytesArrayToBitmap().isSubsetOf(m2QuorumBitmap), OnlyM2QuorumsAllowed());
+        
         // Check if the operator has registered before
         bool operatorRegisteredBefore = _operatorInfo[msg.sender].status == OperatorStatus.REGISTERED;
 
diff --git a/src/interfaces/IRegistryCoordinator.sol b/src/interfaces/IRegistryCoordinator.sol
index 10d3c1ef..a8b3939b 100644
--- a/src/interfaces/IRegistryCoordinator.sol
+++ b/src/interfaces/IRegistryCoordinator.sol
@@ -20,6 +20,8 @@ interface IRegistryCoordinatorErrors is ISlashingRegistryCoordinatorErrors {
     error M2QuorumRegistrationIsDisabled();
     /// @notice Thrown when operator set operations are attempted while not enabled.
     error OperatorSetsNotEnabled();
+    /// @notice Thrown when only M2 quorums are allowed.
+    error OnlyM2QuorumsAllowed();
 }
 
 interface IRegistryCoordinatorTypes is ISlashingRegistryCoordinatorTypes {}