diff --git a/include/zeus/CAABox.hpp b/include/zeus/CAABox.hpp
index 79c083d..7e799d1 100644
--- a/include/zeus/CAABox.hpp
+++ b/include/zeus/CAABox.hpp
@@ -1,5 +1,4 @@
-#ifndef CAABOX_HPP
-#define CAABOX_HPP
+#pragma once
 
 #include "zeus/CVector3f.hpp"
 #include "zeus/CTransform.hpp"
@@ -416,4 +415,3 @@ inline bool operator!=(const CAABox& left, const CAABox& right)
 }
 }
 
-#endif // CAABOX_HPP
diff --git a/include/zeus/CAxisAngle.hpp b/include/zeus/CAxisAngle.hpp
index cda208d..ef07ac0 100644
--- a/include/zeus/CAxisAngle.hpp
+++ b/include/zeus/CAxisAngle.hpp
@@ -1,5 +1,4 @@
-#ifndef CAXISANGLE_H
-#define CAXISANGLE_H
+#pragma once
 
 #include "Global.hpp"
 #include "zeus/CVector3f.hpp"
@@ -24,4 +23,3 @@ struct alignas(16) CAxisAngle : CVector3f
 };
 }
 
-#endif // CAXISANGLE_H
diff --git a/include/zeus/CColor.hpp b/include/zeus/CColor.hpp
index c2a6103..a37c579 100644
--- a/include/zeus/CColor.hpp
+++ b/include/zeus/CColor.hpp
@@ -1,5 +1,4 @@
-#ifndef CCOLOR_HPP
-#define CCOLOR_HPP
+#pragma once
 
 #include "Global.hpp"
 #include "zeus/Math.hpp"
@@ -428,4 +427,3 @@ static inline CColor operator/(float lhs, const CColor& rhs)
 #endif
 }
 }
-#endif // CCOLOR_HPP
diff --git a/include/zeus/CEulerAngles.hpp b/include/zeus/CEulerAngles.hpp
index 6156791..8398402 100644
--- a/include/zeus/CEulerAngles.hpp
+++ b/include/zeus/CEulerAngles.hpp
@@ -1,5 +1,4 @@
-#ifndef CEULERANGES_HPP
-#define CEULERANGES_HPP
+#pragma once
 
 #include "zeus/CVector3f.hpp"
 
@@ -17,4 +16,3 @@ public:
 
 }
 
-#endif // CEULERANGES_HPP
diff --git a/include/zeus/CFrustum.hpp b/include/zeus/CFrustum.hpp
index 6d4391c..b3f4fd7 100644
--- a/include/zeus/CFrustum.hpp
+++ b/include/zeus/CFrustum.hpp
@@ -1,5 +1,4 @@
-#ifndef CFRUSTUM_HPP
-#define CFRUSTUM_HPP
+#pragma once
 
 #include "zeus/CPlane.hpp"
 #include "zeus/CAABox.hpp"
@@ -21,4 +20,3 @@ public:
     bool pointFrustumTest(const CVector3f& point) const;
 };
 }
-#endif // CFRUSTUM_HPP
diff --git a/include/zeus/CLine.hpp b/include/zeus/CLine.hpp
index 35b863c..5cf2f93 100644
--- a/include/zeus/CLine.hpp
+++ b/include/zeus/CLine.hpp
@@ -1,5 +1,4 @@
-#ifndef CLINE_HPP
-#define CLINE_HPP
+#pragma once
 
 #include "Global.hpp"
 #include "zeus/CVector3f.hpp"
@@ -15,4 +14,3 @@ public:
 };
 }
 
-#endif
diff --git a/include/zeus/CLineSeg.hpp b/include/zeus/CLineSeg.hpp
index 74a4723..028aa67 100644
--- a/include/zeus/CLineSeg.hpp
+++ b/include/zeus/CLineSeg.hpp
@@ -1,5 +1,4 @@
-#ifndef CLINESEG_HPP
-#define CLINESEG_HPP
+#pragma once
 
 #include "Global.hpp"
 #include "zeus/CVector3f.hpp"
@@ -24,4 +23,3 @@ public:
 };
 }
 
-#endif
diff --git a/include/zeus/CMRay.hpp b/include/zeus/CMRay.hpp
index 9f7434a..195e1b3 100644
--- a/include/zeus/CMRay.hpp
+++ b/include/zeus/CMRay.hpp
@@ -1,5 +1,4 @@
-#ifndef CMRAY_HPP
-#define CMRAY_HPP
+#pragma once
 #include "zeus/CVector3f.hpp"
 #include "zeus/CTransform.hpp"
 #include "zeus/Math.hpp"
@@ -37,4 +36,3 @@ struct CMRay
 };
 }
 
-#endif
diff --git a/include/zeus/CMatrix3f.hpp b/include/zeus/CMatrix3f.hpp
index ac5096e..6913d2a 100644
--- a/include/zeus/CMatrix3f.hpp
+++ b/include/zeus/CMatrix3f.hpp
@@ -1,5 +1,4 @@
-#ifndef CMATRIX3F_HPP
-#define CMATRIX3F_HPP
+#pragma once
 
 #include "Global.hpp"
 #include "zeus/CVector3f.hpp"
@@ -258,4 +257,3 @@ static inline CMatrix3f operator*(const CMatrix3f& lhs, const CMatrix3f& rhs)
 }
 }
 
-#endif // CMATRIX3F_HPP
diff --git a/include/zeus/CMatrix4f.hpp b/include/zeus/CMatrix4f.hpp
index fe98579..83ef8bc 100644
--- a/include/zeus/CMatrix4f.hpp
+++ b/include/zeus/CMatrix4f.hpp
@@ -1,5 +1,4 @@
-#ifndef CMATRIX4F
-#define CMATRIX4F
+#pragma once
 #include "zeus/CMatrix3f.hpp"
 #include "zeus/CVector4f.hpp"
 #include "zeus/CVector3f.hpp"
@@ -175,4 +174,3 @@ static inline CMatrix4f operator*(const CMatrix4f& lhs, const CMatrix4f& rhs)
 }
 }
 
-#endif // CMATRIX4F
diff --git a/include/zeus/COBBox.hpp b/include/zeus/COBBox.hpp
index c492d99..e8de5fa 100644
--- a/include/zeus/COBBox.hpp
+++ b/include/zeus/COBBox.hpp
@@ -1,5 +1,4 @@
-#ifndef COBBOX_HPP
-#define COBBOX_HPP
+#pragma once
 
 #include "zeus/CTransform.hpp"
 #include "zeus/CVector3f.hpp"
@@ -183,4 +182,3 @@ public:
 };
 }
 
-#endif
diff --git a/include/zeus/CPlane.hpp b/include/zeus/CPlane.hpp
index 43b55bd..2230d88 100644
--- a/include/zeus/CPlane.hpp
+++ b/include/zeus/CPlane.hpp
@@ -1,5 +1,4 @@
-#ifndef CPLANE_HPP
-#define CPLANE_HPP
+#pragma once
 
 #include "Global.hpp"
 #include "zeus/CVector3f.hpp"
@@ -74,4 +73,3 @@ public:
 };
 }
 
-#endif // CPLANE_HPP
diff --git a/include/zeus/CProjection.hpp b/include/zeus/CProjection.hpp
index 3f2e209..e017a32 100644
--- a/include/zeus/CProjection.hpp
+++ b/include/zeus/CProjection.hpp
@@ -1,5 +1,4 @@
-#ifndef CPROJECTION_HPP
-#define CPROJECTION_HPP
+#pragma once
 
 #include "Global.hpp"
 #include "zeus/CMatrix4f.hpp"
@@ -125,4 +124,3 @@ protected:
 };
 }
 
-#endif // CMATRIX3F_HPP
diff --git a/include/zeus/CQuaternion.hpp b/include/zeus/CQuaternion.hpp
index 4817827..dc45989 100644
--- a/include/zeus/CQuaternion.hpp
+++ b/include/zeus/CQuaternion.hpp
@@ -1,5 +1,4 @@
-#ifndef CQUATERNION_HPP
-#define CQUATERNION_HPP
+#pragma once
 
 #include "Global.hpp"
 #include "CAxisAngle.hpp"
@@ -268,4 +267,3 @@ CQuaternion operator-(float lhs, const CQuaternion& rhs);
 CQuaternion operator*(float lhs, const CQuaternion& rhs);
 CNUQuaternion operator*(float lhs, const CNUQuaternion& rhs);
 }
-#endif // CQUATERNION_HPP
diff --git a/include/zeus/CRectangle.hpp b/include/zeus/CRectangle.hpp
index d07f285..8afe170 100644
--- a/include/zeus/CRectangle.hpp
+++ b/include/zeus/CRectangle.hpp
@@ -1,5 +1,4 @@
-#ifndef CRECTANGLE_HPP
-#define CRECTANGLE_HPP
+#pragma once
 #include "zeus/CVector2f.hpp"
 
 namespace zeus
@@ -31,4 +30,3 @@ public:
 };
 }
 
-#endif // CRECTANGLE_HPP
diff --git a/include/zeus/CRelAngle.hpp b/include/zeus/CRelAngle.hpp
index bbdb086..f6c9889 100644
--- a/include/zeus/CRelAngle.hpp
+++ b/include/zeus/CRelAngle.hpp
@@ -1,5 +1,4 @@
-#ifndef CRELANGLE_HPP
-#define CRELANGLE_HPP
+#pragma once
 
 #include "zeus/CVector3f.hpp"
 #include "zeus/Math.hpp"
@@ -53,4 +52,3 @@ struct CRelAngle
 };
 }
 
-#endif // CRELANGLE_HPP
diff --git a/include/zeus/CSphere.hpp b/include/zeus/CSphere.hpp
index 43d9593..5229c51 100644
--- a/include/zeus/CSphere.hpp
+++ b/include/zeus/CSphere.hpp
@@ -1,5 +1,4 @@
-#ifndef CSPHERE_HPP
-#define CSPHERE_HPP
+#pragma once
 
 #include "zeus/CVector3f.hpp"
 
@@ -25,4 +24,3 @@ public:
 };
 }
 
-#endif
diff --git a/include/zeus/CTransform.hpp b/include/zeus/CTransform.hpp
index 9b41dbb..d009f50 100644
--- a/include/zeus/CTransform.hpp
+++ b/include/zeus/CTransform.hpp
@@ -1,5 +1,4 @@
-#ifndef CTRANSFORM_HPP
-#define CTRANSFORM_HPP
+#pragma once
 
 #include "Global.hpp"
 #include "zeus/CMatrix3f.hpp"
@@ -279,4 +278,3 @@ CTransform CTransformFromAxisAngle(const CVector3f& axis, float angle);
 CTransform lookAt(const CVector3f& pos, const CVector3f& lookPos, const CVector3f& up = CVector3f::skUp);
 }
 
-#endif // CTRANSFORM_HPP
diff --git a/include/zeus/CUnitVector.hpp b/include/zeus/CUnitVector.hpp
index 35d94b7..9f07325 100644
--- a/include/zeus/CUnitVector.hpp
+++ b/include/zeus/CUnitVector.hpp
@@ -1,5 +1,4 @@
-#ifndef CUNITVECTOR_HPP
-#define CUNITVECTOR_HPP
+#pragma once
 
 #include "zeus/CVector3f.hpp"
 
@@ -23,4 +22,3 @@ public:
     }
 };
 }
-#endif
diff --git a/include/zeus/CVector2f.hpp b/include/zeus/CVector2f.hpp
index 090b675..df32159 100644
--- a/include/zeus/CVector2f.hpp
+++ b/include/zeus/CVector2f.hpp
@@ -1,5 +1,4 @@
-#ifndef CVECTOR2f_HPP
-#define CVECTOR2f_HPP
+#pragma once
 
 #include "Global.hpp"
 #include "zeus/Math.hpp"
@@ -429,4 +428,3 @@ static inline CVector2f operator/(float lhs, const CVector2f& rhs)
 }
 }
 
-#endif // CVECTOR2F_HPP
diff --git a/include/zeus/CVector2i.hpp b/include/zeus/CVector2i.hpp
index 4280a5a..9ac1e07 100644
--- a/include/zeus/CVector2i.hpp
+++ b/include/zeus/CVector2i.hpp
@@ -1,5 +1,4 @@
-#ifndef CVECTOR2i_HPP
-#define CVECTOR2i_HPP
+#pragma once
 
 #include "Global.hpp"
 #include "zeus/Math.hpp"
@@ -51,4 +50,3 @@ public:
 };
 }
 
-#endif // CVECTOR2i_HPP
diff --git a/include/zeus/CVector3d.hpp b/include/zeus/CVector3d.hpp
index 5f0b8d6..f1f42bb 100644
--- a/include/zeus/CVector3d.hpp
+++ b/include/zeus/CVector3d.hpp
@@ -1,5 +1,4 @@
-#ifndef CVECTOR3D_HPP
-#define CVECTOR3D_HPP
+#pragma once
 
 #include <athena/Types.hpp>
 #include "Global.hpp"
@@ -287,4 +286,3 @@ static inline CVector3d operator/(double lhs, const CVector3d& rhs)
 }
 }
 
-#endif
diff --git a/include/zeus/CVector3f.hpp b/include/zeus/CVector3f.hpp
index 4743c54..ac4abe1 100644
--- a/include/zeus/CVector3f.hpp
+++ b/include/zeus/CVector3f.hpp
@@ -1,5 +1,4 @@
-#ifndef CVECTOR3F_HPP
-#define CVECTOR3F_HPP
+#pragma once
 
 #include "Global.hpp"
 #include "zeus/Math.hpp"
@@ -441,4 +440,3 @@ static inline CVector3f operator/(float lhs, const CVector3f& rhs)
 
 }
 
-#endif // CVECTOR3F_HPP
diff --git a/include/zeus/CVector4f.hpp b/include/zeus/CVector4f.hpp
index 91e8bc4..07ac103 100644
--- a/include/zeus/CVector4f.hpp
+++ b/include/zeus/CVector4f.hpp
@@ -1,5 +1,4 @@
-#ifndef CVECTOR4F_HPP
-#define CVECTOR4F_HPP
+#pragma once
 
 #include "Global.hpp"
 #include "TVectorUnion.hpp"
@@ -418,4 +417,3 @@ static inline CVector4f operator/(float lhs, const CVector4f& rhs)
 }
 }
 
-#endif // CVECTOR4F_HPP
diff --git a/include/zeus/Global.hpp b/include/zeus/Global.hpp
index a2c6849..98096c3 100644
--- a/include/zeus/Global.hpp
+++ b/include/zeus/Global.hpp
@@ -1,5 +1,4 @@
-#ifndef ZEUS_GLOBAL_HPP
-#define ZEUS_GLOBAL_HPP
+#pragma once
 
 #if _M_IX86_FP >= 1 || _M_X64
 #define __SSE__ 1
@@ -61,4 +60,3 @@
 inline int rotr(int x, int n) { return ((x >> n) | (x << (32 - n))); }
 inline int rotl(int x, int n) { return ((x << n) | (x >> (32 - n))); }
 
-#endif // ZEUS_GLOBAL_HPP
diff --git a/include/zeus/Math.hpp b/include/zeus/Math.hpp
index 431b645..825fa6e 100644
--- a/include/zeus/Math.hpp
+++ b/include/zeus/Math.hpp
@@ -1,5 +1,4 @@
-#ifndef MATH_HPP
-#define MATH_HPP
+#pragma once
 
 #include <cfloat>
 #undef min
@@ -156,4 +155,3 @@ inline bool close_enough(double a, double b, double epsilon = 0.0000099999997473
 }
 }
 
-#endif // MATH_HPP
diff --git a/include/zeus/TVectorUnion.hpp b/include/zeus/TVectorUnion.hpp
index 8f7d6f9..2db7fe8 100644
--- a/include/zeus/TVectorUnion.hpp
+++ b/include/zeus/TVectorUnion.hpp
@@ -1,5 +1,4 @@
-#ifndef TVECTORUNION
-#define TVECTORUNION
+#pragma once
 
 namespace zeus
 {
@@ -21,4 +20,3 @@ typedef union {
 } TDblVectorUnion;
 }
 
-#endif // TVECTORUNION
diff --git a/include/zeus/zeus.hpp b/include/zeus/zeus.hpp
index bb6f290..ef6841e 100644
--- a/include/zeus/zeus.hpp
+++ b/include/zeus/zeus.hpp
@@ -1,5 +1,4 @@
-#ifndef __MATHLIB_HPP
-#define __MATHLIB_HPP
+#pragma once
 
 #include "zeus/CAxisAngle.hpp"
 #include "zeus/CRelAngle.hpp"
@@ -25,4 +24,3 @@
 #include "zeus/Global.hpp"
 #include "zeus/Math.hpp"
 
-#endif // __MATHLIB_HPP