diff --git a/.gitignore b/.gitignore
index 96a65ce9870c40ab4ee783f67b212b5a5adf88ae..b9b63c941fc762a6390c5dec37b41c2058edd3be 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,7 +5,7 @@ build/error.log
 build/inclusion/*
 build/libnptm/*
 build/libtool
-build/Makefile
+build/Makefile.in
 build/sphere/*
 build/testing/*
 build/trapping/*