diff --git a/arch/mn10300/include/asm/signal.h b/arch/mn10300/include/asm/signal.h
index 7e891fce2370028acea4a56497aafa74c443c0be..1865d72a86ff7cc6823a7be07dbbb0f3907e2518 100644
--- a/arch/mn10300/include/asm/signal.h
+++ b/arch/mn10300/include/asm/signal.h
@@ -78,7 +78,7 @@ typedef unsigned long sigset_t;
 
 /* These should not be considered constants from userland.  */
 #define SIGRTMIN	32
-#define SIGRTMAX	(_NSIG-1)
+#define SIGRTMAX	_NSIG
 
 /*
  * SA_FLAGS values: