diff --git a/plugins/optimization-detective/class-od-html-tag-processor.php b/plugins/optimization-detective/class-od-html-tag-processor.php
index 51afb4b4e5..4b41d2a864 100644
--- a/plugins/optimization-detective/class-od-html-tag-processor.php
+++ b/plugins/optimization-detective/class-od-html-tag-processor.php
@@ -625,10 +625,12 @@ public function get_updated_html(): string {
 	 *
 	 * @since 0.4.0
 	 *
-	 * @param callable-string $function_name Function name.
-	 * @param string          $message       Warning message.
+	 * @phpstan-param callable-string $function_name
+	 *
+	 * @param string $function_name Function name.
+	 * @param string $message       Warning message.
 	 */
-	private function warn( callable $function_name, string $message ): void {
+	private function warn( string $function_name, string $message ): void {
 		wp_trigger_error(
 			$function_name,
 			esc_html( $message )