1 files changed, 1 insertions, 0 deletions

diff --git a/math.h b/math.h
index 2c94b0b..48519b4 100644
--- a/math.h
+++ b/math.h
@@ -20,6 +20,7 @@
 
 #include <math.h>
 #include <assert.h>
+#include <stdlib.h>
 
 #include "build/config.h"
 #include "vector.h"