--- a/loki_patch/loki_xdelta.c
+++ b/loki_patch/loki_xdelta.c
@@ -179,6 +179,7 @@ struct _XdFileHandle
   guint    narrow_high;
   guint    current_pos;
   FILE*    in;
+  gzFile   zin;
   gboolean (* in_read) (XdFileHandle* handle, void* buf, gint nbyte);
   gboolean (* in_close) (XdFileHandle* handle);
   gboolean in_compressed;
@@ -520,7 +521,7 @@ xd_gzwrite (XdFileHandle* fh, const void* buf, gint nbyte)
 static gboolean
 xd_gzread (XdFileHandle* fh, void* buf, gint nbyte)
 {
-  return gzread (fh->in, buf, nbyte) == nbyte;
+  return gzread (fh->zin, buf, nbyte) == nbyte;
 }
 
 static gboolean
@@ -532,7 +533,7 @@ xd_gzclose (XdFileHandle* fh)
 static gboolean
 xd_gzrclose (XdFileHandle* fh)
 {
-  return gzclose (fh->in) == Z_OK;
+  return gzclose (fh->zin) == Z_OK;
 }
 
 static void
@@ -1022,13 +1023,13 @@ xd_handle_narrow (XdFileHandle* fh, guint low, guint high, gboolean compressed)
 	}
 
       g_assert (fh->fd >= 0);
-      fh->in = gzdopen (dup (fh->fd), "rb");
+      fh->zin = gzdopen (dup (fh->fd), "rb");
       fh->in_read =  &xd_gzread;
       fh->in_close = &xd_gzrclose;
       fh->in_compressed = TRUE;
       fh->current_pos = 0;
 
-      if (! fh->in)
+      if (! fh->zin)
 	{
 	  xd_error ("gzdopen failed: %s\n", g_strerror (errno));
 	  return -1;