diff --git a/auto_log/autolog.h b/auto_log/autolog.h
index 7deec0a..eb1151b 100644
--- a/auto_log/autolog.h
+++ b/auto_log/autolog.h
@@ -20,6 +20,7 @@
 #include <ostream>
 #include <stdlib.h>
 #include <vector>
+#include <numeric>
 #include <glog/logging.h>