diff --git a/tools/inject.py b/tools/inject.py
index 76079d52054..7aef0e9f994 100755
--- a/tools/inject.py
+++ b/tools/inject.py
@@ -178,7 +178,7 @@ def _get_exit_logic(self):
         if (p->stack[p->conds_met - 1] == p->curr_call)
                 p->conds_met--;
         """
-        return text % str(self.length + 1)
+        return text % str(self.length)
 
     def _generate_exit(self):
         prog = self._get_heading() + """