Index: trunk/psphot/src/psphotSkyReplace.c
===================================================================
--- trunk/psphot/src/psphotSkyReplace.c	(revision 20453)
+++ trunk/psphot/src/psphotSkyReplace.c	(revision 21183)
@@ -17,5 +17,5 @@
     // select the corresponding images
     psF32 **image = readout->image->data.F32;
-    psU8  **mask  = readout->mask->data.U8;
+    psImageMaskType  **mask  = readout->mask->data.PS_TYPE_IMAGE_MASK_DATA;
     psF32 **back  = background->image->data.F32;