diff --git a/lgtm.yml b/lgtm.yml
index 8de861fe55..eac32c751e 100644
--- a/lgtm.yml
+++ b/lgtm.yml
@@ -25,6 +25,7 @@ extraction:
       - curl https://codeload.github.com/haiku/buildtools/zip/master -o master.zip
       - mkdir $LGTM_WORKSPACE/buildtools
       - unzip -qq master.zip -d $LGTM_WORKSPACE/buildtools
+      - rm master.zip
       - cd $LGTM_WORKSPACE/buildtools/buildtools-master/jam && make && BINDIR=$LGTM_WORKSPACE/bin ./jam0 install
     configure:
       command: