diff --git a/include/nuttx/userspace.h b/include/nuttx/userspace.h
index 6d1af0276a9..52b92784354 100644
--- a/include/nuttx/userspace.h
+++ b/include/nuttx/userspace.h
@@ -106,6 +106,7 @@ struct userspace_s
   uintptr_t us_dataend;
   uintptr_t us_bssstart;
   uintptr_t us_bssend;
+  uintptr_t us_heapend;
 
   /* Memory manager heap structure */