diff --git a/src/wp-includes/blocks.php b/src/wp-includes/blocks.php
index 31f1b22469..499fab8b3c 100644
--- a/src/wp-includes/blocks.php
+++ b/src/wp-includes/blocks.php
@@ -328,8 +328,9 @@ function register_block_style_handle( $metadata, $field_name, $index = 0 ) {
 	$style_path_norm = wp_normalize_path( realpath( dirname( $metadata['file'] ) . '/' . $style_path ) );
 	$style_uri       = get_block_asset_url( $style_path_norm );
 
-	$version = ! $is_core_block && isset( $metadata['version'] ) ? $metadata['version'] : false;
-	$result  = wp_register_style(
+	$block_version = ! $is_core_block && isset( $metadata['version'] ) ? $metadata['version'] : false;
+	$version       = $style_path_norm && defined( 'SCRIPT_DEBUG' ) && SCRIPT_DEBUG ? filemtime( $style_path_norm ) : $block_version;
+	$result        = wp_register_style(
 		$style_handle_name,
 		$style_uri,
 		array(),