--- a/autoconf/ast_prog_ld.m4
+++ b/autoconf/ast_prog_ld.m4
@@ -7,7 +7,7 @@ AC_DEFUN([AST_PROG_LD],
 	[assume the C compiler uses GNU ld @<:@default=no@:>@])],
     [test "$withval" = no || with_gnu_ld=yes],
     [with_gnu_ld=no])
-AC_REQUIRE([AST_PROG_SED])dnl
+AC_REQUIRE([AC_PROG_SED])dnl
 AC_REQUIRE([AC_PROG_CC])dnl
 AC_REQUIRE([AC_CANONICAL_HOST])dnl
 AC_REQUIRE([AC_CANONICAL_BUILD])dnl