diff --git a/.lgtm.yml b/.lgtm.yml
new file mode 100644
index 0000000000..b62f9fb37b
--- /dev/null
+++ b/.lgtm.yml
@@ -0,0 +1,4 @@
+path_classifiers:
+  thirdparty:
+    - /tools/amalgamate
+    - /tools/cpplint