diff --git a/wp-includes/functions.php b/wp-includes/functions.php
index ef2ce9d9c3..d9303083bf 100644
--- a/wp-includes/functions.php
+++ b/wp-includes/functions.php
@@ -3417,6 +3417,7 @@ function wp_get_image_mime( $file ) {
  * @since 4.2.0 Support was added for GIMP (.xcf) files.
  * @since 4.9.2 Support was added for Flac (.flac) files.
  * @since 4.9.6 Support was added for AAC (.aac) files.
+ * @since 6.8.0 Support was added for `audio/x-wav`.
  *
  * @return string[] Array of mime types keyed by the file extension regex corresponding to those types.
  */
@@ -3481,7 +3482,7 @@ function wp_get_mime_types() {
 			'mp3|m4a|m4b'                  => 'audio/mpeg',
 			'aac'                          => 'audio/aac',
 			'ra|ram'                       => 'audio/x-realaudio',
-			'wav'                          => 'audio/wav',
+			'wav|x-wav'                    => 'audio/wav',
 			'ogg|oga'                      => 'audio/ogg',
 			'flac'                         => 'audio/flac',
 			'mid|midi'                     => 'audio/midi',
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 5027ef3975..f5887d3616 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.8-alpha-59388';
+$wp_version = '6.8-alpha-59389';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.