diff --git a/src/wp-includes/ai-client/adapters/class-wp-ai-client-http-client.php b/src/wp-includes/ai-client/adapters/class-wp-ai-client-http-client.php
index 1c1db9a26c707..d8f1e25e8fa47 100644
--- a/src/wp-includes/ai-client/adapters/class-wp-ai-client-http-client.php
+++ b/src/wp-includes/ai-client/adapters/class-wp-ai-client-http-client.php
@@ -211,7 +211,7 @@ private function create_psr_response( array $wp_response ): ResponseInterface {
 			$headers = $headers->get_headers();
 		}
 
-		if ( is_array( $headers ) || $headers instanceof Traversable ) {
+		if ( is_iterable( $headers ) ) {
 			foreach ( $headers as $name => $value ) {
 				$response = $response->withHeader( $name, $value );
 			}