diff --git a/wp-includes/formatting.php b/wp-includes/formatting.php
index 815719105e..bb56530309 100644
--- a/wp-includes/formatting.php
+++ b/wp-includes/formatting.php
@@ -1919,7 +1919,7 @@ function remove_accents( $string ) {
 		// Used for locale-specific rules.
 		$locale = get_locale();
 
-		if ( in_array( $locale, array( 'de_DE', 'de_DE_formal', 'de_CH', 'de_CH_informal' ), true ) ) {
+		if ( in_array( $locale, array( 'de_AT', 'de_DE', 'de_DE_formal', 'de_CH', 'de_CH_informal' ), true ) ) {
 			$chars['Ä'] = 'Ae';
 			$chars['ä'] = 'ae';
 			$chars['Ö'] = 'Oe';