Index: /trunk/ippTools/src/difftool.c
===================================================================
--- /trunk/ippTools/src/difftool.c	(revision 24954)
+++ /trunk/ippTools/src/difftool.c	(revision 24955)
@@ -582,5 +582,5 @@
     PXOPT_COPY_STR(config->args, where, "-skycell_id", "diffInputSkyfile.skycell_id", "==");
     PXOPT_COPY_S64(config->args, where,  "-diff_skyfile_id", "diffInputSkyfile.diff_skyfile_id", "==");
-    PXOPT_COPY_STR(config->args, where, "-tess_id", "diffSkyfile.tess_id", "==");
+    PXOPT_COPY_STR(config->args, where, "-tess_id", "diffRun.tess_id", "==");
     PXOPT_COPY_S16(config->args, where, "-fault", "diffSkyfile.fault", "==");
     PXOPT_COPY_S64(config->args, where, "-exp_id", "rawExp.exp_id", "==");