diff --git a/lib/des/rnd_keys.c b/lib/des/rnd_keys.c
index 016bfc8d5..a63cde70f 100644
--- a/lib/des/rnd_keys.c
+++ b/lib/des/rnd_keys.c
@@ -72,6 +72,10 @@ RCSID("$Id$");
 #include <fcntl.h>
 #endif
 
+#ifdef HAVE_WINSOCK_H
+#include <winsock.h>
+#endif
+
 /*
  * Generate "random" data by checksumming a file.
  *