diff --git a/.lgtm.yml b/.lgtm.yml
index dd94c12885..222fbde564 100644
--- a/.lgtm.yml
+++ b/.lgtm.yml
@@ -2,6 +2,7 @@ extraction:
   cpp:
     configure:
       command:
+        - make fetch-pb
         - cd racket/src
         - ./configure --disable-docs
     index: