diff --git a/library/PolyVoxCore/include/Material.h b/library/PolyVoxCore/include/Material.h
index 3910dae9..3a860016 100644
--- a/library/PolyVoxCore/include/Material.h
+++ b/library/PolyVoxCore/include/Material.h
@@ -27,6 +27,8 @@ freely, subject to the following restrictions:
 #include "PolyVoxForwardDeclarations.h"
 #include "PolyVoxImpl/TypeDef.h"
 
+#include <cassert>
+
 namespace PolyVox
 {
 	///This class represents a voxel storing only a material.