diff --git a/contrib/fb303/aclocal/ax_thrift_internal.m4 b/contrib/fb303/aclocal/ax_thrift_internal.m4
index 8c0e3cb..097bcf5 100644
--- a/contrib/fb303/aclocal/ax_thrift_internal.m4
+++ b/contrib/fb303/aclocal/ax_thrift_internal.m4
@@ -18,7 +18,7 @@
 AC_DEFUN([AX_THRIFT_LIB],
          [
           AC_ARG_WITH($1,
-                      AC_HELP_STRING([--with-$1], [build the $2 library @<:@default=$3@:>@]),
+                      AS_HELP_STRING([--with-$1], [build the $2 library @<:@default=$3@:>@]),
                       [with_$1="$withval"],
                       [with_$1=$3]
                       )