diff -u b/core/modules/image/src/PathProcessor/PathProcessorImageStyles.php b/core/modules/image/src/PathProcessor/PathProcessorImageStyles.php
--- b/core/modules/image/src/PathProcessor/PathProcessorImageStyles.php
+++ b/core/modules/image/src/PathProcessor/PathProcessorImageStyles.php
@@ -48,10 +48,11 @@
     if (strpos($path, '/' . $directory_path . '/styles/') === 0) {
       $path_prefix = '/' . $directory_path . '/styles/';
     }
-    // In case of private file's image style also handle situation when the
-    // language code is prefixed to the path.
-    elseif (preg_match('|^(/[a-z]{2}[\-a-z]*)?/system/files/styles/|', $path, $matches)) {
-      $path_prefix = $matches[0];
+    // Check if the string '/system/files/styles/' exists inside the path,
+    // that means we have a case of private file's image style.
+    elseif (strpos($path, '/system/files/styles/') !== FALSE) {
+      $path_prefix = '/system/files/styles/';
+      $path = substr($path, strpos($path, $path_prefix), strlen($path));
     }
     else {
       return $path;