diff --git a/configure.ac.in b/configure.ac.in
index 838efdb..91324d6 100644
--- a/configure.ac.in
+++ b/configure.ac.in
@@ -17,7 +17,7 @@ dnl ***************************
 AC_COPYRIGHT([Copyright (c) 2006-2016 The Xfce development team])
 AC_INIT([xfce4-eyes-plugin], [eyes_version], [http://bugzilla.xfce.org/], [xfce4-eyes-plugin])
 AC_PREREQ([2.60])
-AC_CONFIG_MACRO_DIR([m4])
+AC_CONFIG_MACRO_DIRS([m4])
 AC_CANONICAL_TARGET()
 
 dnl ***************************