diff --git a/tests/test_cache.py b/tests/test_cache.py
index d20bd1d..d64788b 100644
--- a/tests/test_cache.py
+++ b/tests/test_cache.py
@@ -8,11 +8,12 @@ async def test_cache(run_str_multi):
   conf = r'''
 [cache-1]
 source = "cmd"
-cmd = "echo $RANDOM"
+cmd = "bash -c 'echo $RANDOM'"
 
 [cache-2]
 source = "cmd"
-cmd = "echo $RANDOM"'''
+cmd = "bash -c 'echo $RANDOM'"
+'''
 
   r = await run_str_multi(conf)
   assert r['cache-1'] == r['cache-2']