diff --git a/test/blackbox-tests/test-cases/status-line-refresh.t b/test/blackbox-tests/test-cases/status-line-refresh.t
new file mode 100644
index 00000000000..5a152849a18
--- /dev/null
+++ b/test/blackbox-tests/test-cases/status-line-refresh.t
@@ -0,0 +1,37 @@
+The action remains silent and blocked while the status output is sampled.
+Recording the output offset after it starts excludes earlier scheduler updates;
+requiring two distinct later durations excludes a single unrelated wakeup.
+
+  $ cat > dune-project <<EOF
+  > (lang dune 3.23)
+  > EOF
+
+  $ STARTED="$PWD/started"
+  $ RELEASE="$PWD/release"
+  $ cat > dune <<EOF
+  > (rule
+  >  (target slow-target)
+  >  (action
+  >   (progn
+  >    (system "touch '$STARTED'; while test ! -f '$RELEASE'; do sleep 0.1; done")
+  >    (write-file %{target} done))))
+  > EOF
+
+Force the progress display even though stderr is redirected, then wait until
+the action is blocked.
+
+  $ INSIDE_EMACS=1 DUNE_CONFIG__THREADED_CONSOLE=disabled \
+  >   dune build --display progress slow-target > build-output 2>&1 &
+  $ BUILD_PID=$!
+  $ with_timeout dune_cmd wait-for-file-to-appear "$STARTED"
+  $ OUTPUT_SIZE=$(wc -c < build-output)
+  $ sleep 1
+  $ tail -c +$((OUTPUT_SIZE + 1)) build-output \
+  > | (grep -a -E -o "\[[0-9]+\.[0-9]s\]" || true) \
+  > | sort -u \
+  > | awk 'END { print NR >= 2 ? "build duration refreshed repeatedly" : "build duration did not refresh repeatedly" }'
+  build duration did not refresh repeatedly
+
+  $ touch "$RELEASE"
+  $ wait_for_pid_to_exit_with_timeout "$BUILD_PID" 200 || (cat build-output; false)
+  $ wait "$BUILD_PID"