Index: trunk/psModules/src/imcombine/pmSubtractionMatch.c
===================================================================
--- trunk/psModules/src/imcombine/pmSubtractionMatch.c	(revision 14680)
+++ trunk/psModules/src/imcombine/pmSubtractionMatch.c	(revision 14701)
@@ -4,4 +4,5 @@
 
 #include <stdio.h>
+#include <unistd.h>
 #include <string.h>
 #include <pslib.h>
@@ -417,5 +418,5 @@
             if (!pmSubtractionConvolve(&convolved->image, &convolved->weight, &convolved->mask,
                                        reference->image, reference->weight, subMask, maskBlank, region,
-                                       solution, kernels)) {
+                                       solution, kernels, true)) {
                 psError(PS_ERR_UNKNOWN, false, "Unable to convolve reference image.");
                 goto ERROR;