diff --git a/src/libsuperderpy.h b/src/libsuperderpy.h
index 95d51bd..edd2f3e 100644
--- a/src/libsuperderpy.h
+++ b/src/libsuperderpy.h
@@ -52,6 +52,7 @@ struct GamestateResources;
 #include "timeline.h"
 #include "tween.h"
 #include "utils.h"
+#include <math.h>
 #include <sys/param.h>
 
 struct Gamestate;