--- Coro/Coro/State.xs	2007/09/21 01:10:55	1.156
+++ Coro/Coro/State.xs	2007/09/21 02:01:13	1.157
@@ -397,8 +397,7 @@
      * (and reinitialize) all cv's in the whole callchain :(
      */
 
-    EXTEND (SP, 3 + 1);
-    PUSHs (Nullsv);
+    XPUSHs (Nullsv);
     /* this loop was inspired by pp_caller */
     for (;;)
       {