Index: /trunk/ppArith/src/ppArithArguments.c
===================================================================
--- /trunk/ppArith/src/ppArithArguments.c	(revision 16188)
+++ /trunk/ppArith/src/ppArithArguments.c	(revision 16189)
@@ -72,5 +72,5 @@
 
     bool isMask = psMetadataLookupBool(NULL, arguments, "-mask"); // Are we dealing with masks?
-    psMetadataAddBool(config->arguments, PS_LIST_TAIL, "MASK", 0, "Produce a mask image?", true);
+    psMetadataAddBool(config->arguments, PS_LIST_TAIL, "MASK", 0, "Produce a mask image?", isMask);
     const char *inFilerule = isMask ? "PPARITH.INPUT.MASK" : "PPARITH.INPUT.IMAGE"; // Input file rule
     const char *outFilerule = isMask ? "PPARITH.OUTPUT.MASK" : "PPARITH.OUTPUT.IMAGE"; // Output file rule