diff --git a/defs.h b/defs.h
index f60b558..344e4e1 100644
--- a/defs.h
+++ b/defs.h
@@ -531,6 +531,7 @@
 #endif
 
 extern int current_personality;
+extern const int personality_wordsize[];
 
 struct sysent {
 	int	nargs;