diff --git a/configure.ac b/configure.ac
index 5148a01..06106ef 100644
--- a/configure.ac
+++ b/configure.ac
@@ -27,7 +27,6 @@ if test "x$PKG_CONFIG_INSTALLED" = "xno"; then
         AC_MSG_ERROR([You need to install pkg-config])
 fi
 
-AC_CONFIG_MACRO_DIRS([m4])
 AC_CONFIG_MACRO_DIR([m4])
 
 AC_ARG_ENABLE(sanitize,