--- a/acinclude.m4
+++ b/acinclude.m4
@@ -8,7 +8,7 @@
 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