diff --git a/includes/class-http.php b/includes/class-http.php
index e243997..35003b8 100644
--- a/includes/class-http.php
+++ b/includes/class-http.php
@@ -52,7 +52,7 @@ class Http {
 		$response = \wp_safe_remote_post( $url, $args );
 		$code     = \wp_remote_retrieve_response_code( $response );
 
-		if ( 400 <= $code && 500 >= $code ) {
+		if ( $code <= 400 ) {
 			$response = new WP_Error( $code, __( 'Failed HTTP Request', 'activitypub' ) );
 		}
 
@@ -100,7 +100,7 @@ class Http {
 		$response = \wp_safe_remote_get( $url, $args );
 		$code     = \wp_remote_retrieve_response_code( $response );
 
-		if ( 400 <= $code && 500 >= $code ) {
+		if ( $code <= 400 ) {
 			$response = new WP_Error( $code, __( 'Failed HTTP Request', 'activitypub' ) );
 		}