diff --git a/src/wp-includes/block-bindings/post-data.php b/src/wp-includes/block-bindings/post-data.php
index 37699a3faf0c4..103aa2e850419 100644
--- a/src/wp-includes/block-bindings/post-data.php
+++ b/src/wp-includes/block-bindings/post-data.php
@@ -60,7 +60,7 @@ function _register_block_bindings_post_data_source() {
 		array(
 			'label'              => _x( 'Post Data', 'block bindings source' ),
 			'get_value_callback' => '_block_bindings_post_data_get_value',
-			'uses_context'       => array( 'postId' ),
+			'uses_context'       => array( 'postId', 'postType' ), // Both are needed on the client side.
 		)
 	);
 }