Index: trunk/pswarp/src/pswarpLoop.c
===================================================================
--- trunk/pswarp/src/pswarpLoop.c	(revision 26896)
+++ trunk/pswarp/src/pswarpLoop.c	(revision 26964)
@@ -367,4 +367,10 @@
     }
 
+    // Update ZP from the astrometry
+    {
+        psMetadataItem *item = psMetadataLookup(outFPA->concepts, "FPA.ZP");
+        item->data.F32 = psMetadataLookupF32(NULL, astrom->fpa->concepts, "FPA.ZP");
+    }
+
     pmHDU *hdu = outFPA->hdu;           ///< HDU for the output warped image