diff --git a/lib/isc/win32/include/isc/time.h b/lib/isc/win32/include/isc/time.h
index f49c3a774c..5c82e33839 100644
--- a/lib/isc/win32/include/isc/time.h
+++ b/lib/isc/win32/include/isc/time.h
@@ -15,6 +15,7 @@
 #include <errno.h>
 #include <inttypes.h>
 #include <stdbool.h>
+#include <time.h>
 #include <windows.h>
 
 #include <isc/lang.h>