diff --git a/wp-includes/functions.php b/wp-includes/functions.php
index ed41eed8c7..c2fe1228bf 100644
--- a/wp-includes/functions.php
+++ b/wp-includes/functions.php
@@ -2257,11 +2257,11 @@ function get_temp_dir() {
  * @return bool Whether the path is writable.
  */
 function wp_is_writable( $path ) {
-	if ( 'WIN' === strtoupper( substr( PHP_OS, 0, 3 ) ) ) {
+	if ( 'Windows' === PHP_OS_FAMILY ) {
 		return win_is_writable( $path );
-	} else {
-		return @is_writable( $path );
 	}
+
+	return @is_writable( $path );
 }
 
 /**
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 4bcce31037..62ecf5f741 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.7-alpha-58683';
+$wp_version = '6.7-alpha-58684';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.