diff --git a/packages/block-editor/src/components/block-lock/modal.js b/packages/block-editor/src/components/block-lock/modal.js
index d48c5ca177d05..7dd66f76be154 100644
--- a/packages/block-editor/src/components/block-lock/modal.js
+++ b/packages/block-editor/src/components/block-lock/modal.js
@@ -122,7 +122,7 @@ export default function BlockLockModal( { clientId, onClose } ) {
 											/>
 										</>
 									}
-									checked={ lock.edit }
+									checked={ !! lock.edit }
 									onChange={ ( edit ) =>
 										setLock( ( prevLock ) => ( {
 											...prevLock,