Index: /trunk/psphot/src/psphotStackMatchPSFsNext.c
===================================================================
--- /trunk/psphot/src/psphotStackMatchPSFsNext.c	(revision 36540)
+++ /trunk/psphot/src/psphotStackMatchPSFsNext.c	(revision 36541)
@@ -105,4 +105,5 @@
 	psLogMsg ("psphot", PS_LOG_INFO, "target FWHM (%f) is smaller than current FWHM (%f), not smoothing\n", targetFWHM, currentFWHM);
 	fwhmValues->data.F32[lastSize + 1] = currentFWHM;
+        pmReadoutMaskInvalid(readout, maskVal, maskSat);
 	return false;
     }