diff --git a/include/nuttx/compiler.h b/include/nuttx/compiler.h
index fd4ce63336..dc994002e4 100644
--- a/include/nuttx/compiler.h
+++ b/include/nuttx/compiler.h
@@ -82,6 +82,7 @@
 #if defined(__ghs__)
 
 #  define __extension__
+#  define register
 
 #endif