diff --git a/.travis.yml b/.travis.yml
index ece7425fe3d..5589b0002d6 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,7 +1,7 @@
 cache: cargo
 before_cache:
   - find ./target/debug -type f -maxdepth 1 -delete
-  - rm -fr ./target/debug/{deps,.fingerprint}/{*ra_*,*test*,*tools*,*gen_lsp*}
+  - rm -fr ./target/debug/{deps,.fingerprint}/{*ra_*,*test*,*tools*,*gen_lsp*,*thread_worker*}
   - rm -f  ./target/.rustc_info.json
 
 env: