--- a/src/lib/image.c	Tue Dec 29 00:22:57 2009 +0200
+++ b/src/lib/image.c	Tue Dec 29 01:06:52 2009 +0200
@@ -117,7 +117,7 @@
     png_infop info;
 
     // pre-check enabled
-    if (!(image->cache->mode & PT_IMG_WRITE)) {
+    if (!(image->cache->mode & PT_OPEN_UPDATE)) {
         errno = EPERM;
         return -1;
     }