diff --git a/src/game/game.h b/src/game/game.h
index d454b98..c65872b 100644
--- a/src/game/game.h
+++ b/src/game/game.h
@@ -1,9 +1,15 @@
 #pragma once
 
-#include <stdint.h>
+#include <math.h>
 
 #include "gametime.h"
 
+// constants for pi(π) and tau(τ)
+#define PI   (M_PI)         // π constant
+#define TAU  (M_PI * 2.0)   // τ constant
+#define PIf  (M_PIf)        //
+#define TAUf (M_PIf * 2.0F) //
+
 typedef struct {
     gametime time;
 } gamedata;
diff --git a/src/util/gen/dynarr.h b/src/util/gen/dynarr.h
index 49e76fb..15a09ea 100644
--- a/src/util/gen/dynarr.h
+++ b/src/util/gen/dynarr.h
@@ -1,13 +1,13 @@
 #ifndef DYNARR_H
 #define DYNARR_H
 #include <stddef.h>
-#include <stdint.h>
 
 #define DYNARR_COMB2(a, b) a##b
 #define DYNARR_COMB1(a, b) DYNARR_COMB2(a, b)
 #endif // DYNARR_H
 
 #ifdef DYNARR_TYPE
+#include <stdint.h>
 #include <stdlib.h>
 #include <string.h>