diff --git a/m4/ao.m4 b/m4/ao.m4
index a2bfa67de..a852ad86c 100644
--- a/m4/ao.m4
+++ b/m4/ao.m4
@@ -6,7 +6,7 @@
 dnl XIPH_PATH_AO([ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND]])
 dnl Test for libao, and define AO_CFLAGS and AO_LIBS
 dnl
-AC_DEFUN(XIPH_PATH_AO,
+AC_DEFUN([XIPH_PATH_AO],
 [dnl 
 dnl Get the cflags and libraries
 dnl
diff --git a/m4/libFLAC.m4 b/m4/libFLAC.m4
index 88d8e84c3..b6950e7bd 100644
--- a/m4/libFLAC.m4
+++ b/m4/libFLAC.m4
@@ -4,7 +4,7 @@
 dnl AM_PATH_LIBFLAC([ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND]])
 dnl Test for libFLAC, and define LIBFLAC_CFLAGS and LIBFLAC_LIBS
 dnl
-AC_DEFUN(AM_PATH_LIBFLAC,
+AC_DEFUN([AM_PATH_LIBFLAC],
 [dnl 
 dnl Get the cflags and libraries
 dnl
diff --git a/m4/libmikmod.m4 b/m4/libmikmod.m4
index a87f6572d..18feebec0 100644
--- a/m4/libmikmod.m4
+++ b/m4/libmikmod.m4
@@ -8,7 +8,7 @@ dnl AM_PATH_LIBMIKMOD([MINIMUM-VERSION, [ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND
 dnl Test for libmikmod, and define LIBMIKMOD_CFLAGS, LIBMIKMOD_LIBS and
 dnl LIBMIKMOD_LDADD
 dnl
-AC_DEFUN(AM_PATH_LIBMIKMOD,
+AC_DEFUN([AM_PATH_LIBMIKMOD],
 [dnl 
 dnl Get the cflags and libraries from the libmikmod-config script
 dnl
diff --git a/m4/ogg.m4 b/m4/ogg.m4
index 0f428756b..0e1f1abf5 100644
--- a/m4/ogg.m4
+++ b/m4/ogg.m4
@@ -5,7 +5,7 @@
 dnl XIPH_PATH_OGG([ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND]])
 dnl Test for libogg, and define OGG_CFLAGS and OGG_LIBS
 dnl
-AC_DEFUN(XIPH_PATH_OGG,
+AC_DEFUN([XIPH_PATH_OGG],
 [dnl 
 dnl Get the cflags and libraries
 dnl
diff --git a/m4/vorbis.m4 b/m4/vorbis.m4
index d311a410a..300cc6c7d 100644
--- a/m4/vorbis.m4
+++ b/m4/vorbis.m4
@@ -6,7 +6,7 @@
 dnl XIPH_PATH_VORBIS([ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND]])
 dnl Test for libvorbis, and define VORBIS_CFLAGS and VORBIS_LIBS
 dnl
-AC_DEFUN(XIPH_PATH_VORBIS,
+AC_DEFUN([XIPH_PATH_VORBIS],
 [dnl 
 dnl Get the cflags and libraries
 dnl