diff --git a/CFrustum.hpp b/CFrustum.hpp
index 8edd132..b9004bc 100644
--- a/CFrustum.hpp
+++ b/CFrustum.hpp
@@ -1,7 +1,7 @@
 #ifndef CFRUSTUM_HPP
 #define CFRUSTUM_HPP
 
-#include <MathLib.hpp>
+#include "CPlane.hpp"
 #include "SBoundingBox.hpp"
 
 class CFrustum
diff --git a/MathLib.hpp b/MathLib.hpp
index 28b0031..4e0f19d 100644
--- a/MathLib.hpp
+++ b/MathLib.hpp
@@ -12,6 +12,8 @@
 #include "CVector4f.hpp"
 #include "CRectangle.hpp"
 #include "CPlane.hpp"
+#include "SBoundingBox.hpp"
+#include "CFrustum.hpp"
 #include "CColor.hpp"
 #include "Global.hpp"
 #include "Math.hpp"
diff --git a/MathLib.pri b/MathLib.pri
index 1db0cee..ea05251 100644
--- a/MathLib.pri
+++ b/MathLib.pri
@@ -27,6 +27,8 @@ HEADERS += \
     $$PWD/CRectangle.hpp \
     $$PWD/CMatrix4f.hpp \
     $$PWD/TVectorUnion.hpp \
-    $$PWD/CVector4f.hpp
+    $$PWD/CVector4f.hpp \
+    $$PWD/CFrustum.hpp \
+    $$PWD/SBoundingBox.hpp
 
 INCLUDEPATH += $$PWD
diff --git a/SBoundingBox.hpp b/SBoundingBox.hpp
index 841b1b2..b33e070 100644
--- a/SBoundingBox.hpp
+++ b/SBoundingBox.hpp
@@ -1,6 +1,7 @@
 #ifndef BOUNDINGBOX_HPP
 #define BOUNDINGBOX_HPP
-#include <MathLib.hpp>
+
+#include "CVector3f.hpp"
 #include <Athena/IStreamReader.hpp>
 
 struct SBoundingBox