diff --git a/src/lightmap/collision.h b/src/lightmap/collision.h
index 6fcb5e1..0cf66bb 100644
--- a/src/lightmap/collision.h
+++ b/src/lightmap/collision.h
@@ -24,6 +24,7 @@
 
 #include "math/mathlib.h"
 #include <vector>
+#include <cmath>
 
 class SphereShape
 {