diff --git a/configure.ac b/configure.ac
index 7bfe011..b6d7159 100644
--- a/configure.ac
+++ b/configure.ac
@@ -20,7 +20,7 @@ AC_CONFIG_SRCDIR([configure.ac])
 AC_CONFIG_MACRO_DIR([m4])
 AC_CONFIG_HEADERS([config.h])
 
-AM_INIT_AUTOMAKE([1.6 dist-bzip2 foreign])
+AM_INIT_AUTOMAKE([1.6 dist-bzip2 foreign subdir-objects])
 m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
 AC_USE_SYSTEM_EXTENSIONS