diff --git a/repos/base/include/base/thread.h b/repos/base/include/base/thread.h
index 08f7531afb..23c85e88c3 100644
--- a/repos/base/include/base/thread.h
+++ b/repos/base/include/base/thread.h
@@ -49,6 +49,7 @@ class Genode::Thread
 		typedef Affinity::Location  Location;
 		typedef Cpu_session::Name   Name;
 		typedef Cpu_session::Weight Weight;
+		typedef unsigned Numa_id;
 
 		struct Stack_info { addr_t base; addr_t top;
 		                    addr_t libc_tls_pointer_offset; };