diff --git a/tests/phpunit/tests/admin/includes/misc/gotModRewrite.php b/tests/phpunit/tests/admin/includes/misc/gotModRewrite.php
index b53219cdb9d35..8c10b1af77b69 100644
--- a/tests/phpunit/tests/admin/includes/misc/gotModRewrite.php
+++ b/tests/phpunit/tests/admin/includes/misc/gotModRewrite.php
@@ -78,7 +78,7 @@ static function ( $got_rewrite ) use ( $filter_value, &$filtered_value ) {
 	 *     filter_value: bool,
 	 * }>
 	 */
-	public function data_got_mod_rewrite(): array {
+	public static function data_got_mod_rewrite(): array {
 		return array(
 			'Apache, filter returns true'      => array(
 				'is_apache'    => true,
diff --git a/tests/phpunit/tests/admin/includes/misc/iis7AddRewriteRule.php b/tests/phpunit/tests/admin/includes/misc/iis7AddRewriteRule.php
index 52b4f7c61fd57..6b05e7959194d 100644
--- a/tests/phpunit/tests/admin/includes/misc/iis7AddRewriteRule.php
+++ b/tests/phpunit/tests/admin/includes/misc/iis7AddRewriteRule.php
@@ -68,7 +68,7 @@ public function test_iis7_add_rewrite_rule( $initial_content, $rewrite_rule, $ex
 	 *     expected_content: string,
 	 * }>
 	 */
-	public function data_iis7_add_rewrite_rule(): array {
+	public static function data_iis7_add_rewrite_rule(): array {
 		$rule = '<rule name="wordpress" patternSyntax="Wildcard"><match url="*" /><conditions><add input="{REQUEST_FILENAME}" matchType="IsFile" negate="true" /><add input="{REQUEST_FILENAME}" matchType="IsDirectory" negate="true" /></conditions><action type="Rewrite" url="index.php" /></rule>';
 
 		return array(
diff --git a/tests/phpunit/tests/admin/includes/misc/iis7RewriteRuleExists.php b/tests/phpunit/tests/admin/includes/misc/iis7RewriteRuleExists.php
index 83532b1f51983..54c4fab750e84 100644
--- a/tests/phpunit/tests/admin/includes/misc/iis7RewriteRuleExists.php
+++ b/tests/phpunit/tests/admin/includes/misc/iis7RewriteRuleExists.php
@@ -60,7 +60,7 @@ public function test_iis7_rewrite_rule_exists( $expected, $content ) {
 	 *
 	 * @return array<string, array{expected: bool, content: string}>
 	 */
-	public function data_iis7_rewrite_rule_exists(): array {
+	public static function data_iis7_rewrite_rule_exists(): array {
 		return array(
 			'Rule with name starting with "wordpress" exists' => array(
 				'expected' => true,
diff --git a/tests/phpunit/tests/admin/includes/misc/wpMakePluginFileTree.php b/tests/phpunit/tests/admin/includes/misc/wpMakePluginFileTree.php
index 7489ce44a498e..577c7ba8e567a 100644
--- a/tests/phpunit/tests/admin/includes/misc/wpMakePluginFileTree.php
+++ b/tests/phpunit/tests/admin/includes/misc/wpMakePluginFileTree.php
@@ -29,7 +29,7 @@ public function test_wp_make_plugin_file_tree( $plugin_editable_files, $expected
 	 *     expected:              array<string, mixed>,
 	 * }>
 	 */
-	public function data_wp_make_plugin_file_tree(): array {
+	public static function data_wp_make_plugin_file_tree(): array {
 		return array(
 			'empty_list'          => array(
 				'plugin_editable_files' => array(),