diff --git a/system/src/Grav/Common/Data/Blueprint.php b/system/src/Grav/Common/Data/Blueprint.php
index 19448bc58..768d8e41d 100644
--- a/system/src/Grav/Common/Data/Blueprint.php
+++ b/system/src/Grav/Common/Data/Blueprint.php
@@ -75,7 +75,7 @@ class Blueprint
         try {
             $this->validateArray($data, $this->nested);
         } catch (\RuntimeException $e) {
-            throw new \RuntimeException(sprintf('Page validation failed: %s', $e->getMessage()));
+            throw new \RuntimeException(sprintf('<b>Validation failed:</b> %s', $e->getMessage()));
         }
     }