diff --git a/src/wp-includes/blocks.php b/src/wp-includes/blocks.php
index b37ff94ddc..c75179b411 100644
--- a/src/wp-includes/blocks.php
+++ b/src/wp-includes/blocks.php
@@ -902,7 +902,7 @@ function register_block_style( $block_name, $style_properties ) {
  * @since 5.3.0
  *
  * @param string $block_name       Block type name including namespace.
- * @param array  $block_style_name Block style name.
+ * @param string $block_style_name Block style name.
  * @return bool True if the block style was unregistered with success and false otherwise.
  */
 function unregister_block_style( $block_name, $block_style_name ) {