diff --git a/.travis.yml b/.travis.yml
index d9282d3..76ca5bb 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -86,10 +86,10 @@ jobs:
       rust: nightly
       env: CACHE_NAME=coverage
       script:
-        - RUSTFLAGS="--cfg procmacro2_semver_exempt" cargo install cargo-tarpaulin || true
+        - RUSTFLAGS="--cfg procmacro2_semver_exempt" cargo install --force cargo-tarpaulin || true
         - cargo tarpaulin --out Xml
         - bash <(curl -s https://codecov.io/bash)
-        - cargo clean # ensure we don't cache build for coverage
+        - cargo clean -p imap # ensure we don't cache build for coverage
 stages:
  - check
  - test