diff --git a/m4/glib.m4 b/m4/glib.m4
index b8094bbfe..b3c632b0e 100644
--- a/m4/glib.m4
+++ b/m4/glib.m4
@@ -5,7 +5,7 @@ dnl AM_PATH_GLIB([MINIMUM-VERSION, [ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND [, MO
 dnl Test for GLIB, and define GLIB_CFLAGS and GLIB_LIBS, if "gmodule" or 
 dnl gthread is specified in MODULES, pass to glib-config
 dnl
-AC_DEFUN(AM_PATH_GLIB,
+AC_DEFUN([AM_PATH_GLIB],
 [dnl 
 dnl Get the cflags and libraries from the glib-config script
 dnl
diff --git a/m4/pkg.m4 b/m4/pkg.m4
index c80e0acfc..f2bfc2d49 100644
--- a/m4/pkg.m4
+++ b/m4/pkg.m4
@@ -2,7 +2,7 @@
 dnl PKG_CHECK_MODULES(GSTUFF, gtk+-2.0 >= 1.3 glib = 1.3.4, action-if, action-not)
 dnl defines GSTUFF_LIBS, GSTUFF_CFLAGS, see pkg-config man page
 dnl also defines GSTUFF_PKG_ERRORS on error
-AC_DEFUN(PKG_CHECK_MODULES, [
+AC_DEFUN([PKG_CHECK_MODULES], [
   succeeded=no
 
   if test -z "$PKG_CONFIG"; then