diff --git a/KREngine/KREngine/Classes/KRNode.cpp b/KREngine/KREngine/Classes/KRNode.cpp
index 6235ca5..6174a9f 100644
--- a/KREngine/KREngine/Classes/KRNode.cpp
+++ b/KREngine/KREngine/Classes/KRNode.cpp
@@ -7,6 +7,7 @@
 //
 
 #include <iostream>
+#include <assert.h>
 
 #import "KRNode.h"
 #import "KRPointLight.h"