diff --git a/lib/simple-local-avatars/includes/class-simple-local-avatars.php b/lib/simple-local-avatars/includes/class-simple-local-avatars.php
index 0a2cdb1c..98c02522 100644
--- a/lib/simple-local-avatars/includes/class-simple-local-avatars.php
+++ b/lib/simple-local-avatars/includes/class-simple-local-avatars.php
@@ -925,7 +925,7 @@ public function assign_new_user_avatar( $url_or_media_id, $user_id ) {
 		$meta_value = array();
 
 		// set the new avatar
-		if ( is_int( $url_or_media_id + 0 ) ) {
+		if ( is_numeric( $url_or_media_id ) ) {
 			$meta_value['media_id'] = $url_or_media_id;
 			$url_or_media_id        = wp_get_attachment_url( $url_or_media_id );
 		}