diff --git a/include/asm-um/a.out.h b/include/asm-um/a.out.h
index 50cee7b296f4..7016b893ac9d 100644
--- a/include/asm-um/a.out.h
+++ b/include/asm-um/a.out.h
@@ -5,6 +5,7 @@
 #include "choose-mode.h"
 
 #undef STACK_TOP
+#undef STACK_TOP_MAX
 
 extern unsigned long stacksizelim;