diff --git a/src/wp-includes/blocks.php b/src/wp-includes/blocks.php
index 49f18ca46f8f..0abbfd3a9705 100644
--- a/src/wp-includes/blocks.php
+++ b/src/wp-includes/blocks.php
@@ -134,7 +134,7 @@ function register_block_script_handle( $metadata, $field_name, $index = 0 ) {
 		$wpinc_path_norm = wp_normalize_path( realpath( ABSPATH . WPINC ) );
 	}
 
-	$theme_path_norm  = wp_normalize_path( get_theme_file_path() );
+	$theme_path_norm  = wp_normalize_path( realpath( get_theme_file_path() ) );
 	$script_path_norm = wp_normalize_path( realpath( dirname( $metadata['file'] ) . '/' . $script_path ) );
 
 	$is_core_block  = isset( $metadata['file'] ) && 0 === strpos( $metadata['file'], $wpinc_path_norm );