diff --git a/selinux/runcon.c b/selinux/runcon.c
index 89a4b05..0f573d1 100644
--- a/selinux/runcon.c
+++ b/selinux/runcon.c
@@ -88,7 +88,7 @@
 #define OPTS_CONTEXT_COMPONENT		(OPTS_ROLE | OPTS_TYPE | OPTS_USER | OPTS_RANGE)
 
 int runcon_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
-int runcon_main(int argc, char **argv)
+int runcon_main(int argc ATTRIBUTE_UNUSED, char **argv)
 {
 	char *role = NULL;
 	char *range = NULL;