diff --git a/ucf b/ucf
index 766a715..efe9871 100755
--- a/ucf
+++ b/ucf
@@ -468,7 +468,7 @@ elif [ ! "x$UCF_OLD_MDSUM_FILE" = "x" ]; then
     setq old_mdsum_file "$UCF_OLD_MDSUM_FILE" "The md5sum is found here"
 elif [ ! "x$conf_old_mdsum_file" = "x" ]; then
     setq old_mdsum_file "$conf_old_mdsum_file" "Replace the old file"
-else
+elif [ -n "$new_file" ]; then
     old_mdsum_file="$source_dir/$(basename ${new_file}).md5sum";
 fi