diff --git a/AtlasTest/TestTools/share/post.sh b/AtlasTest/TestTools/share/post.sh
index c457699ac1f8113f5728ab19b0d6fba62bd766dc..f9dd9f45c3848f378234a930682f368768313803 100755
--- a/AtlasTest/TestTools/share/post.sh
+++ b/AtlasTest/TestTools/share/post.sh
@@ -316,10 +316,10 @@ else
            process $joblog $jobdiff
            process $reflog $refdiff
 
-           diff -a -b -E -B -u $jobdiff $refdiff
+           diff -a -b -E -B -u $refdiff $jobdiff
            diffStatus=$?
            if [ $diffStatus != 0 ] ; then
-               echo "$RED post.sh> ERROR: $joblog and $reflog differ $RESET"
+               echo "$RED post.sh> ERROR: $reflog and $joblog differ $RESET"
                # Return with failure in this case:
                exit 1
            fi