diff --git a/Voice.cpp b/Voice.cpp
index 440e72c..6203d24 100644
--- a/Voice.cpp
+++ b/Voice.cpp
@@ -24,6 +24,7 @@
 #include "Log.h"
 
 #include <cstring>
+#include <cstdlib>
 
 #include <sys/stat.h>