diff --git a/.gitignore b/.gitignore
index 8721ca5a8..2ecc92aad 100644
--- a/.gitignore
+++ b/.gitignore
@@ -36,4 +36,5 @@ verilator_coverage_bin*
 verilator.pc
 verilator-config.cmake
 verilator-config-version.cmake
+**/_build/*
 **/obj_dir/*
diff --git a/MANIFEST.SKIP b/MANIFEST.SKIP
index 298886f43..f765c3326 100644
--- a/MANIFEST.SKIP
+++ b/MANIFEST.SKIP
@@ -19,6 +19,7 @@
 .*\.1
 \.codacy\.yml
 \.travis\.yml
+/_build/
 /build/
 /obj_dbg/
 /obj_dir/