diff --git a/tests/tools/test_transcription_tools.py b/tests/tools/test_transcription_tools.py
index e9d7b50b32..3efd0b7efe 100644
--- a/tests/tools/test_transcription_tools.py
+++ b/tests/tools/test_transcription_tools.py
@@ -1203,12 +1203,19 @@ class TestRunCommandSttIdleTimeout:
         from tools.transcription_command import _run_command_stt
 
         script = tmp_path / "progress_then_exit.py"
+        # First tick is emitted immediately and the rest every 50ms — the
+        # total runtime (~400ms) exceeds the 250ms idle window, so passing
+        # depends on the progress extension. The immediate first tick also
+        # keeps the test honest on Windows, where process spawn alone can
+        # exceed a tiny idle window and previously raised TimeoutExpired
+        # before the first chunk was ever read (with all child output intact).
         script.write_text(
             "\n".join([
                 "import sys, time",
-                "for idx in range(4):",
+                "print('tick 0', file=sys.stderr, flush=True)",
+                "for idx in range(1, 9):",
+                "    time.sleep(0.05)",
                 "    print(f'tick {idx}', file=sys.stderr, flush=True)",
-                "    time.sleep(0.04)",
                 "print('done', flush=True)",
             ]),
             encoding="utf-8",
@@ -1216,11 +1223,11 @@ class TestRunCommandSttIdleTimeout:
 
         result = _run_command_stt(
             self._shell_command(sys.executable, "-u", str(script)),
-            timeout=0.1,
+            timeout=0.25,
         )
 
         assert result.returncode == 0
-        assert "tick 3" in result.stderr
+        assert "tick 8" in result.stderr
         assert "done" in result.stdout
 
     def test_silent_stall_still_times_out(self, tmp_path):