diff --git a/backport-changelog/6.8/7265.md b/backport-changelog/6.8/7265.md
index d4c46d62fa333..44ba36053aa0d 100644
--- a/backport-changelog/6.8/7265.md
+++ b/backport-changelog/6.8/7265.md
@@ -1,3 +1,4 @@
 https://github.com/WordPress/wordpress-develop/pull/7265
 
 * https://github.com/WordPress/gutenberg/pull/66850
+* https://github.com/WordPress/gutenberg/pull/66947
diff --git a/lib/compat/wordpress-6.8/functions.php b/lib/compat/wordpress-6.8/functions.php
index eb57b2bb9890e..a4658d1a182c7 100644
--- a/lib/compat/wordpress-6.8/functions.php
+++ b/lib/compat/wordpress-6.8/functions.php
@@ -18,7 +18,7 @@ function gutenberg_get_mime_types_6_8( $mime_types ) {
 	 * Only add support if there is existing support for 'wav'.
 	 * Some plugins may have deliberately disabled it.
 	*/
-	if ( ! $mime_types['wav'] && ! isset( $mime_types['wav|x-wav'] ) ) {
+	if ( ! isset( $mime_types['wav'] ) && ! isset( $mime_types['wav|x-wav'] ) ) {
 		return $mime_types;
 	}
 	/*