diff --git a/ci/miri.sh b/ci/miri.sh
index fa6054821..118436ccb 100755
--- a/ci/miri.sh
+++ b/ci/miri.sh
@@ -19,6 +19,7 @@ case "${group}" in
             cargo miri test --all-features \
             -p crossbeam-channel 2>&1 | ts -i '%.s  '
         # -Zmiri-ignore-leaks is needed because we use detached threads in tests in tests/golang.rs: https://github.com/rust-lang/miri/issues/1371
+        MIRI_LEAK_CHECK='1' \
         MIRIFLAGS="${MIRIFLAGS} -Zmiri-ignore-leaks" \
             cargo miri test --all-features \
             -p crossbeam-channel --test golang 2>&1 | ts -i '%.s  '