diff --git a/appl/telnet/config.h.in b/appl/telnet/config.h.in
index ca3097473..2ec48a632 100644
--- a/appl/telnet/config.h.in
+++ b/appl/telnet/config.h.in
@@ -111,6 +111,12 @@
 /* Define if you have the util library (-lutil).  */
 #undef HAVE_LIBUTIL
 
+#ifdef __STDC__
+#define RCSID(msg) static const char *rcsid[] = { (char *)rcsid, "@(#)" msg }
+#else
+#define RCSID(msg) static char *rcsid[] = { (char *)rcsid, msg }
+#endif
+
 /* set this to a sensible login */
 #ifndef LOGIN_PATH
 #define LOGIN_PATH "/usr/athena/bin/login"