diff --git a/getopt.h b/getopt.h
index 18e102696cafb023e8eaf1c9edb990744ba56b56..76cf5eeeac1583afc403885c384293955d201163 100644
--- a/getopt.h
+++ b/getopt.h
@@ -141,23 +141,23 @@ struct option
 /* Many other libraries have conflicting prototypes for getopt, with
    differences in the consts, in stdlib.h.  To avoid compilation
    errors, only prototype getopt for the GNU C library.  */
-extern int getopt (int __argc, char *const *__argv, const char *__shortopts);
+extern int getopt (int argc, char *const *argv, const char *shortopts);
 # else /* not __GNU_LIBRARY__ */
 extern int getopt ();
 # endif /* __GNU_LIBRARY__ */
 
 # ifndef __need_getopt
-extern int getopt_long (int __argc, char *const *__argv, const char *__shortopts,
-		        const struct option *__longopts, int *__longind);
-extern int getopt_long_only (int __argc, char *const *__argv,
-			     const char *__shortopts,
-		             const struct option *__longopts, int *__longind);
+extern int getopt_long (int argc, char *const *argv, const char *shortopts,
+		        const struct option *longopts, int *longind);
+extern int getopt_long_only (int argc, char *const *argv,
+			     const char *shortopts,
+		             const struct option *longopts, int *longind);
 
 /* Internal only.  Users should not call this directly.  */
-extern int _getopt_internal (int __argc, char *const *__argv,
-			     const char *__shortopts,
-		             const struct option *__longopts, int *__longind,
-			     int __long_only);
+extern int _getopt_internal (int argc, char *const *argv,
+			     const char *shortopts,
+		             const struct option *longopts, int *longind,
+			     int long_only);
 # endif
 #else /* not __STDC__ */
 extern int getopt ();