diff --git a/m4/.gitignore b/m4/.gitignore
index 20f26034..18d4a4f2 100644
--- a/m4/.gitignore
+++ b/m4/.gitignore
@@ -1,4 +1,5 @@
 codeset.m4
+extern-inline.m4
 fcntl-o.m4
 gettext.m4
 glibc2.m4