diff --git a/.lgtm.yml b/.lgtm.yml
index 6c82e6fea..ba170c958 100644
--- a/.lgtm.yml
+++ b/.lgtm.yml
@@ -9,3 +9,8 @@ path_classifiers:
 queries:
   # Nmap and friends use 'o' as the global options object, among others.
   - exclude: cpp/short-global-name
+extraction:
+  javascript:
+    # We don't have any js code in our codebase, but LGTM tries to run on any HTML.
+    index:
+      exclude: "*"