diff --git a/src/wp-includes/blocks.php b/src/wp-includes/blocks.php
index f4da0320d4565..97c5951a0e06a 100644
--- a/src/wp-includes/blocks.php
+++ b/src/wp-includes/blocks.php
@@ -170,7 +170,8 @@ function register_block_script_handle( $metadata, $field_name, $index = 0 ) {
 		$script_handle,
 		$script_uri,
 		$script_dependencies,
-		isset( $script_asset['version'] ) ? $script_asset['version'] : false
+		isset( $script_asset['version'] ) ? $script_asset['version'] : false,
+		array( 'strategy' => 'defer' )
 	);
 	if ( ! $result ) {
 		return false;