Index: trunk/psphot/src/psphotSourceFits.c
===================================================================
--- trunk/psphot/src/psphotSourceFits.c	(revision 11702)
+++ trunk/psphot/src/psphotSourceFits.c	(revision 12601)
@@ -363,5 +363,5 @@
     // use the source moments, etc to guess basic model parameters
     pmModel *EXT = pmSourceModelGuess (source, modelTypeEXT);
-    assert (EXT != NULL);
+    PS_ASSERT (EXT, NULL);
 	
     // if (isnan(EXT->params->data.F32[1])) psAbort("nan in ext fit");