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diff --git a/src/mathconstants.h b/src/mathconstants.h
index c180d14..1910a4e 100644
--- a/src/mathconstants.h
+++ b/src/mathconstants.h
@@ -16,5 +16,6 @@
 
 #define PI                 3.14159265358979323846264338327
 #define PI_OVER_2          (PI / 2.0)
+#define PI3_OVER_2         ((3.0 * PI) / 2.0)
 #define RADIANS_TO_DEGREES (180.0 / PI)
 #define DEGREES_TO_RADIANS (PI / 180.0)