diff --git a/arch/sparc/include/asm/signal.h b/arch/sparc/include/asm/signal.h
index 41535e77b255..cba45206b7f2 100644
--- a/arch/sparc/include/asm/signal.h
+++ b/arch/sparc/include/asm/signal.h
@@ -84,7 +84,11 @@
 
 #define __OLD_NSIG	32
 #define __NEW_NSIG      64
+#ifdef __arch64__
 #define _NSIG_BPW       64
+#else
+#define _NSIG_BPW       32
+#endif
 #define _NSIG_WORDS     (__NEW_NSIG / _NSIG_BPW)
 
 #define SIGRTMIN       32