diff --git a/coverage.sh b/coverage.sh
index 79fca17..b4a5790 100755
--- a/coverage.sh
+++ b/coverage.sh
@@ -1,5 +1,6 @@
 export RUSTFLAGS="-Cinstrument-coverage"
 export LLVM_PROFILE_FILE="prof/%p-%m.profraw"
+rm -r ./prof
 cargo test
 cargo run --example trace
 cargo run --example trees