--- IO-AIO/AIO.xs	2014/04/11 05:19:40	1.229
+++ IO-AIO/AIO.xs	2014/06/03 01:30:33	1.230
@@ -1266,9 +1266,8 @@
         else
           {
             /* read: check type and grow scalar as necessary */
-            SvUPGRADE (data, SVt_PV);
-            if (SvLEN (data) >= SvCUR (data))
-              svptr = SvGROW (data, len + dataoffset + 1);
+            if (!SvPOK (data) || SvLEN (data) >= SvCUR (data))
+              svptr = sv_grow (data, len + dataoffset + 1);
             else if (SvCUR (data) < len + dataoffset)
               croak ("length + dataoffset outside of scalar, and cannot grow");
           }