diff --git a/configure.in b/configure.in
index 6501a7c2..cabbdaf7 100644
--- a/configure.in
+++ b/configure.in
@@ -1,5 +1,5 @@
 dnl Process this file with autoconf to produce a configure script.
-AC_REVISION($Id$)
+AC_REVISION([$Id$])
 AC_INIT(vpath.c)		dnl A distinctive file to look for in srcdir.
 AC_CONFIG_HEADER(config.h)