diff --git a/src/userprog/tss.h b/src/userprog/tss.h
new file mode 100644
index 0000000000000000000000000000000000000000..467bd19e51ffc4f1bce00ea88496302c9ae9d6f2
--- /dev/null
+++ b/src/userprog/tss.h
@@ -0,0 +1,11 @@
+#ifndef USERPROG_TSS_H
+#define USERPROG_TSS_H
+
+#include <stdint.h>
+
+struct tss;
+void tss_init (void);
+struct tss *tss_get (void);
+void tss_update (void);
+
+#endif /* userprog/tss.h */