diff --git a/.github/workflows/grcov.yml b/.github/workflows/grcov.yml
index b775b38..0512db4 100644
--- a/.github/workflows/grcov.yml
+++ b/.github/workflows/grcov.yml
@@ -34,7 +34,7 @@ jobs:
           args: --all
         env:
           CARGO_INCREMENTAL: 0
-          RUSTFLAGS: "-Zprofile -Ccodegen-units=1 -Cinline-threshold=0 -Clink-dead-code -Coverflow-checks=off -Zpanic_abort_tests"
+          RUSTFLAGS: "-Zprofile -Ccodegen-units=1 -Cinline-threshold=0 -Clink-dead-code -Coverflow-checks=off -Zpanic_abort_tests -Zinstrument-coverage"
 
       # Note that `actions-rs/grcov` Action can install `grcov` too,
       # but can't use faster installation methods yet.