diff -u b/core/includes/theme.inc b/core/includes/theme.inc
--- b/core/includes/theme.inc
+++ b/core/includes/theme.inc
@@ -2006,14 +2006,14 @@
   // Add a class that tells us what path the page is located make it possible
   // to theme the page depending on the current path (e.g. node, admin, user,
   // etc.) as well as more specific data like path-frontpage or
-  // path-contenttype.
+  // path-$contenttype.
+  $path = \Drupal::request()->getPathInfo();
 
   if(drupal_is_front_page()){
     $body_classes[] = 'path-frontpage';
-  }
-  if(request_path()){
-    $path = explode("/", request_path());
-    $body_classes[] = 'path-' . $path[0];
+  }else{
+    $segment = explode("/", $path);
+    $body_classes[] = 'path-' . $segment[1];
   }
 
   $variables['attributes']['class'] = $body_classes;