diff --git a/src/history_file.h b/src/history_file.h
index 8bd209180..bc5992011 100644
--- a/src/history_file.h
+++ b/src/history_file.h
@@ -6,6 +6,7 @@
 #include <sys/mman.h>
 
 #include <cassert>
+#include <ctime>
 #include <memory>
 
 #include "maybe.h"