diff --git a/lib/Cake/Core/Configure.php b/lib/Cake/Core/Configure.php
index b90fcfc6d..ad241254c 100644
--- a/lib/Cake/Core/Configure.php
+++ b/lib/Cake/Core/Configure.php
@@ -98,7 +98,12 @@ class Configure {
 				self::$_values['Error'],
 				self::$_values['Exception']
 			);
-			unset($error, $exception);
+
+			// Preload Debugger + String in case of E_STRICT errors when loading files.
+			if (self::$_values['debug'] > 0) {
+				class_exists('Debugger');
+				class_exists('String');
+			}
 		}
 	}