Index: /trunk/psModules/src/imcombine/pmSubtractionMatch.c
===================================================================
--- /trunk/psModules/src/imcombine/pmSubtractionMatch.c	(revision 24291)
+++ /trunk/psModules/src/imcombine/pmSubtractionMatch.c	(revision 24292)
@@ -337,5 +337,5 @@
         PS_ASSERT_FLOAT_LESS_THAN_OR_EQUAL(optThreshold, 1.0, false);
     }
-    PS_ASSERT_INT_POSITIVE(iter, false);
+    PS_ASSERT_INT_NONNEGATIVE(iter, false);
     PS_ASSERT_FLOAT_LARGER_THAN(rej, 0.0, false);