diff --git a/sources/demo/Objects.cpp b/sources/demo/Objects.cpp
index 705644ac..2fc2280b 100755
--- a/sources/demo/Objects.cpp
+++ b/sources/demo/Objects.cpp
@@ -84,7 +84,7 @@ void Cube::draw() const {
     glTranslatef(x, y, z);
 
     // Rotation of the cube according to its orientation
-    glRotatef(orientationAngle/pi*180.0, orientationAxis.getX(), orientationAxis.getY(), orientationAxis.getZ());
+    glRotatef(orientationAngle/PI*180.0, orientationAxis.getX(), orientationAxis.getY(), orientationAxis.getZ());
 
     // Draw the cube
     glutSolidCube(size);
diff --git a/sources/demo/OutSideCamera.cpp b/sources/demo/OutSideCamera.cpp
index a6ad14f5..59013809 100644
--- a/sources/demo/OutSideCamera.cpp
+++ b/sources/demo/OutSideCamera.cpp
@@ -21,9 +21,6 @@
 #include "OutSideCamera.h"
 #include <cmath>
 
-// Constants
-const double PI = 3.141592;
-
 // Constructor
 OutSideCamera::OutSideCamera() {