Index: branches/pap/pswarp/src/pswarpLoop.c
===================================================================
--- branches/pap/pswarp/src/pswarpLoop.c	(revision 23580)
+++ branches/pap/pswarp/src/pswarpLoop.c	(revision 23597)
@@ -397,5 +397,5 @@
             // This is likely a data quality issue
             // XXX Split into multiple cases using error codes?
-            psErrorStackPrint("Unable to determine PSF");
+            psErrorStackPrint(stderr, "Unable to determine PSF");
             psWarning("Unable to determine PSF --- suspect bad data quality.");
             if (stats && psMetadataLookupS32(NULL, stats, "QUALITY") == 0) {