diff --git a/src/thread/pthread_attr_setdetachstate.c b/src/thread/pthread_attr_setdetachstate.c
index bfffba8c0c4b126c91a4587d40fb18413713b9be..1b7127839a0064fa3633ff6ceb5f1d4e7dd5bc97 100644
--- a/src/thread/pthread_attr_setdetachstate.c
+++ b/src/thread/pthread_attr_setdetachstate.c
@@ -2,6 +2,7 @@
 
 int pthread_attr_setdetachstate(pthread_attr_t *a, int state)
 {
+	if (state > 1U) return EINVAL;
 	a->_a_detach = state;
 	return 0;
 }
diff --git a/src/thread/pthread_attr_setscope.c b/src/thread/pthread_attr_setscope.c
index a970a819b52d38472ae3e13b60a46a6d1251b761..d56ee391a1dd77aad23c83805856d3018af957ec 100644
--- a/src/thread/pthread_attr_setscope.c
+++ b/src/thread/pthread_attr_setscope.c
@@ -2,5 +2,6 @@
 
 int pthread_attr_setscope(pthread_attr_t *a, int scope)
 {
+	if (scope > 1U) return EINVAL;
 	return 0;
 }