diff --git a/blaze822.c b/blaze822.c
index 73b516b..0fcc276 100644
--- a/blaze822.c
+++ b/blaze822.c
@@ -145,7 +145,7 @@ blaze822_addr(char *s, char **dispo, char **addro)
 	}
 	
 	c = disp;
-	e = disp + sizeof disp;
+	e = disp + sizeof disp - 1;
 
 	*disp = 0;
 	*addr = 0;