diff --git a/include/stdatomic.h b/include/stdatomic.h
index bda28ec..156d381 100644
--- a/include/stdatomic.h
+++ b/include/stdatomic.h
@@ -1,6 +1,7 @@
 
 #pragma once
 
+#include <cia/def.h>
 #include <wchar.h>
 #include <stddef.h>
 
diff --git a/include/threads.h b/include/threads.h
index 82eab15..893f1c1 100644
--- a/include/threads.h
+++ b/include/threads.h
@@ -1,6 +1,9 @@
 
 #pragma once
 
+#include <cia/def.h>
+#include <tinyrt.h>
+
 typedef int (*thrd_start_t)(void *);
 
 struct thrd_t typedef thrd_t;