diff --git a/contracts/token/ERC6909/extensions/ERC6909ContentURI.sol b/contracts/token/ERC6909/extensions/ERC6909ContentURI.sol
index 353de29c5df..d697f3ff72e 100644
--- a/contracts/token/ERC6909/extensions/ERC6909ContentURI.sol
+++ b/contracts/token/ERC6909/extensions/ERC6909ContentURI.sol
@@ -19,6 +19,13 @@ contract ERC6909ContentURI is ERC6909, IERC6909ContentURI {
     /// @dev See {IERC1155-URI}
     event URI(string value, uint256 indexed id);
 
+    /**
+     * @dev Signals support for the Content URI extension so off-chain clients can safely rely on it.
+     */
+    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
+        return interfaceId == type(IERC6909ContentURI).interfaceId || super.supportsInterface(interfaceId);
+    }
+
     /// @inheritdoc IERC6909ContentURI
     function contractURI() public view virtual override returns (string memory) {
         return _contractURI;