Do not gitignore source/opt/build_module.*
diff --git a/.gitignore b/.gitignore
index 8933fe9..5295aef 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,4 @@
-build*
+/build*
 .ycm_extra_conf.py*
 compile_commands.json
 /external/googletest/