diff --git a/bob/bio/base/test/test_transformers.py b/bob/bio/base/test/test_transformers.py
index ed8575b8b68682c9ba4b73189b09e59dcff4026a..e78049d736482e56f0afdd3e000b35853b6810d4 100644
--- a/bob/bio/base/test/test_transformers.py
+++ b/bob/bio/base/test/test_transformers.py
@@ -277,7 +277,7 @@ def test_wrap_bob_pipeline():
             if with_dask:
                 pipeline = mario.wrap(["dask"], pipeline)
                 transformed_samples = (
-                    pipeline.fit(training_samples).transform(test_samples).compute()
+                    pipeline.fit(training_samples).transform(test_samples).compute(scheduler="single-threaded")
                 )
             else:
                 transformed_samples = pipeline.fit(training_samples).transform(
diff --git a/bob/bio/base/test/test_vanilla_biometrics.py b/bob/bio/base/test/test_vanilla_biometrics.py
index 2a85d33442826288b461b8b2a6f521c510d5846d..99920add1d1d75be26a7cd369ebc0098c2911442 100644
--- a/bob/bio/base/test/test_vanilla_biometrics.py
+++ b/bob/bio/base/test/test_vanilla_biometrics.py
@@ -148,7 +148,7 @@ def test_on_memory():
             )
 
             if with_dask:
-                scores = scores.compute()
+                scores = scores.compute(scheduler="single-threaded")
 
             assert len(scores) == 10
             for probe_ssets in scores: