--- CV/CV.xs	2005/02/08 11:00:11	1.12
+++ CV/CV.xs	2005/02/08 11:03:30	1.13
@@ -262,7 +262,7 @@
             char *hist;
 
             SV *histsv = newSV (257);
-            sv_upgrade (histsv, SVt_PV);
+            SvPOK_on (histsv);
             SvCUR_set (histsv, 256);
             hist = SvPVX (histsv);