diff --git a/adapters/libev.h b/adapters/libev.h
index 7b2b6af..5701af4 100644
--- a/adapters/libev.h
+++ b/adapters/libev.h
@@ -1,3 +1,4 @@
+#include <stdlib.h>
 #include <sys/types.h>
 #include <ev.h>
 #include "../hiredis.h"