diff --git a/openvpn/time/epoch.hpp b/openvpn/time/epoch.hpp
index 7abc6862..77f178bb 100644
--- a/openvpn/time/epoch.hpp
+++ b/openvpn/time/epoch.hpp
@@ -21,6 +21,8 @@
 
 #pragma once
 
+#include <time.h>
+
 #include <openvpn/time/timespec.hpp>
 
 namespace openvpn {