diff --git a/acinclude.m4 b/acinclude.m4
index 7baaf0b1..35486a0a 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -1,4 +1,4 @@
-AC_DEFUN(SAVE_LIBRARY_VERSION, [
+AC_DEFUN([SAVE_LIBRARY_VERSION], [
 AC_MSG_CHECKING(for library version)
 SND_LIB_VERSION=$VERSION
 echo $VERSION > $srcdir/version