diff --git a/tests/models/test_fancy_ptycho.py b/tests/models/test_fancy_ptycho.py
index 7ef429f..3f78a73 100644
--- a/tests/models/test_fancy_ptycho.py
+++ b/tests/models/test_fancy_ptycho.py
@@ -5,6 +5,8 @@ import torch as t
 import cdtools
 from matplotlib import pyplot as plt
 
+# Force all reconstructions to use the same RNG seed
+t.manual_seed(0)
 
 def test_center_probe(lab_ptycho_cxi):
     dataset = cdtools.datasets.Ptycho2DDataset.from_cxi(lab_ptycho_cxi)
diff --git a/tests/models/test_simple_ptycho.py b/tests/models/test_simple_ptycho.py
index f74dd0d..f77c589 100644
--- a/tests/models/test_simple_ptycho.py
+++ b/tests/models/test_simple_ptycho.py
@@ -1,6 +1,10 @@
 import pytest
 import cdtools
 from matplotlib import pyplot as plt
+import torch as t
+
+# Force all reconstructions to use the same RNG seed
+t.manual_seed(0)
 
 @pytest.mark.slow
 def test_simple_ptycho(lab_ptycho_cxi, reconstruction_device, show_plot):