diff --git a/test/test_stack_sampler.py b/test/test_stack_sampler.py
index fe073c72..da0b8477 100644
--- a/test/test_stack_sampler.py
+++ b/test/test_stack_sampler.py
@@ -6,7 +6,7 @@
 
 from pyinstrument import stack_sampler
 
-from .util import do_nothing
+from .util import do_nothing, flaky_in_ci
 
 
 class SampleCounter:
@@ -23,6 +23,7 @@ def test_create():
     assert sampler is stack_sampler.get_stack_sampler()
 
 
+@flaky_in_ci
 def test_get_samples():
     sampler = stack_sampler.get_stack_sampler()
     counter = SampleCounter()
@@ -45,6 +46,7 @@ def test_get_samples():
     assert len(sampler.subscribers) == 0
 
 
+@flaky_in_ci
 def test_multiple_samplers():
     sampler = stack_sampler.get_stack_sampler()
     counter_1 = SampleCounter()
@@ -86,6 +88,7 @@ def test_multiple_samplers_async_error():
     sampler.unsubscribe(counter_1.sample)
 
 
+@flaky_in_ci
 def test_multiple_contexts():
     sampler = stack_sampler.get_stack_sampler()