diff --git a/src/lxc/Makefile.am b/src/lxc/Makefile.am
index 265467599..924cf1d5f 100644
--- a/src/lxc/Makefile.am
+++ b/src/lxc/Makefile.am
@@ -1,4 +1,5 @@
 pkginclude_HEADERS = \
+		arguments.h \
 		start.h \
 		console.h \
 		error.h \
diff --git a/src/lxc/arguments.h b/src/lxc/arguments.h
index d5ccaefe3..6a2ffc683 100644
--- a/src/lxc/arguments.h
+++ b/src/lxc/arguments.h
@@ -61,6 +61,9 @@ struct lxc_arguments {
 	/* remaining arguments */
 	char *const *argv;
 	int argc;
+
+	/* private arguments */
+	void *data;
 };
 
 #define LXC_COMMON_OPTIONS \