diff --git a/m4/.gitignore b/m4/.gitignore
index 985c2800..a7628601 100644
--- a/m4/.gitignore
+++ b/m4/.gitignore
@@ -1,3 +1,4 @@
+build-to-host.m4
 codeset.m4
 extern-inline.m4
 fcntl-o.m4