diff --git a/lang/cpp/src/key.h b/lang/cpp/src/key.h
--- a/lang/cpp/src/key.h
+++ b/lang/cpp/src/key.h
@@ -30,7 +30,7 @@
 #include "gpgmefw.h"
 
 #include <memory>
-#include <sys/time.h>
+#include <ctime>
 
 #include <vector>
 #include <algorithm>