diff --git a/wsutil/wsgetopt.h b/wsutil/wsgetopt.h
index b497914dec..b2a981693b 100644
--- a/wsutil/wsgetopt.h
+++ b/wsutil/wsgetopt.h
@@ -27,17 +27,6 @@
 
 #include "ws_symbol_export.h"
 
-/* If __GNU_LIBRARY__ is not already defined, either we are being used
-   standalone, or this is the first header included in the source file.
-   If we are being used with glibc, we need to include <features.h>, but
-   that does not exist if we are standalone.  So: if __GNU_LIBRARY__ is
-   not defined, include <ctype.h>, which will pull in <features.h> for us
-   if it's from glibc.  (Why ctype.h?  It's guaranteed to exist and it
-   doesn't flood the namespace with stuff the way some other headers do.)  */
-#if !defined __GNU_LIBRARY__
-# include <ctype.h>
-#endif
-
 #ifndef __THROW
 # ifndef __GNUC_PREREQ
 #  define __GNUC_PREREQ(maj, min) (0)