diff --git a/cipher/ChangeLog b/cipher/ChangeLog
index 29eaeac5f..a3c31f95a 100644
--- a/cipher/ChangeLog
+++ b/cipher/ChangeLog
@@ -1,3 +1,7 @@
+2001-12-19  Werner Koch  <wk@gnupg.org>
+
+	* rndw32.c [CYGWIN32]: Include winioctl.h.  By Disastry.
+
 2001-11-08  Werner Koch  <wk@gnupg.org>
 
 	* primegen.c (gen_prime): Set 2 high order bits for secret primes.
diff --git a/cipher/rndw32.c b/cipher/rndw32.c
index 278ea8ec2..484b11c52 100644
--- a/cipher/rndw32.c
+++ b/cipher/rndw32.c
@@ -67,6 +67,9 @@
 #include <string.h>
 
 #include <windows.h>
+#ifdef __CYGWIN32__
+# include <winioctl.h>
+#endif
 
 
 #include "types.h"