diff --git a/configure.ac b/configure.ac
index aaa7ee03..91f2fac7 100644
--- a/configure.ac
+++ b/configure.ac
@@ -30,6 +30,7 @@ AC_SUBST([CFLAGS])
 AC_PREREQ([2.60])
 
 AC_CONFIG_AUX_DIR([config])
+AC_CONFIG_MACRO_DIR([m4])
 dnl AC_USE_SYSTEM_EXTENSIONS must be called before any macros that run
 dnl the compiler (like AC_PROG_LIBTOOL) to avoid autoconf errors.
 AC_USE_SYSTEM_EXTENSIONS