diff --git a/contrib/minizip/configure.ac b/contrib/minizip/configure.ac
index 6e3fff37..860c6bae 100644
--- a/contrib/minizip/configure.ac
+++ b/contrib/minizip/configure.ac
@@ -7,7 +7,7 @@ AM_INIT_AUTOMAKE([foreign])
 LT_INIT
 
 AC_MSG_CHECKING([whether to build example programs])
-AC_ARG_ENABLE([demos], AC_HELP_STRING([--enable-demos], [build example programs]))
+AC_ARG_ENABLE([demos], AS_HELP_STRING([--enable-demos], [build example programs]))
 AM_CONDITIONAL([COND_DEMOS], [test "$enable_demos" = yes])
 if test "$enable_demos" = yes
 then