Index: trunk/psModules/src/imcombine/pmSubtraction.c
===================================================================
--- trunk/psModules/src/imcombine/pmSubtraction.c	(revision 19765)
+++ trunk/psModules/src/imcombine/pmSubtraction.c	(revision 19766)
@@ -1324,4 +1324,7 @@
     }
 
+    psFree(sys1);
+    psFree(sys2);
+
     // Copy anything that wasn't convolved
     switch (kernels->mode) {