diff --git a/focal_point.install b/focal_point.install
index 09a852f..eb694e2 100644
--- a/focal_point.install
+++ b/focal_point.install
@@ -86,7 +86,7 @@ function focal_point_update_8002(&$sandbox) {
     /** @var \Drupal\file\FileInterface $file */
     $file = $file_storage->load($focal_point->fid);
 
-    if (!isNull($file)) {
+    if (!is_null($file)) {
       // Try to load width and height from the image fields and fall back to
       // reading image file if that was not successful.
       $usage = $file_usage->listUsage($file);