diff --git a/libs/.gitignore b/libs/.gitignore
index 24e32c1954..cc42ba4fa4 100644
--- a/libs/.gitignore
+++ b/libs/.gitignore
@@ -355,6 +355,7 @@
 /libsndfile/Cfg/missing
 /libsndfile/M4/Makefile
 /libsndfile/M4/Makefile.in
+/libsndfile/M4/lt~obsolete.m4
 /libsndfile/Makefile
 /libsndfile/Makefile.in
 /libsndfile/Octave/Makefile