diff --git a/1990/tbr/.gitignore b/1990/tbr/.gitignore
index 01f95f739..341d63c34 100644
--- a/1990/tbr/.gitignore
+++ b/1990/tbr/.gitignore
@@ -1,3 +1,4 @@
 tbr
 tbr.orig
+tbr.alt
 prog.orig