diff --git a/Eule/Constants.h b/Eule/Constants.h
index aab055b..0fc2462 100644
--- a/Eule/Constants.h
+++ b/Eule/Constants.h
@@ -3,13 +3,13 @@
 // Pretty sure the compiler will optimize these calculations out...
 
 //! Pi up to 50 decimal places
-#define PI 3.14159265358979323846264338327950288419716939937510
+static constexpr double PI = 3.14159265358979323846264338327950288419716939937510;
 
 //! Pi divided by two
-#define HALF_PI 1.57079632679489661923132169163975144209858469968755
+static constexpr double HALF_PI = 1.57079632679489661923132169163975144209858469968755;
 
 //! Factor to convert degrees to radians 
-#define Deg2Rad 0.0174532925199432957692369076848861271344287188854172222222222222
+static constexpr double Deg2Rad = 0.0174532925199432957692369076848861271344287188854172222222222222;
 
 //! Factor to convert radians to degrees
-#define Rad2Deg 57.295779513082320876798154814105170332405472466564427711013084788
+static constexpr double Rad2Deg = 57.295779513082320876798154814105170332405472466564427711013084788;