diff --git a/src/sass_context_wrapper.h b/src/sass_context_wrapper.h
index 958547789..b9120eb17 100644
--- a/src/sass_context_wrapper.h
+++ b/src/sass_context_wrapper.h
@@ -1,3 +1,4 @@
+#include <stdlib.h>
 #include <nan.h>
 #include <condition_variable>
 #include "libsass/sass_context.h"