diff --git a/tests/test_OFTI.py b/tests/test_OFTI.py
index 0779fd35..ed4f85b7 100644
--- a/tests/test_OFTI.py
+++ b/tests/test_OFTI.py
@@ -15,6 +15,8 @@
 import orbitize.system
 from orbitize.hipparcos import HipparcosLogProb
 
+np.random.seed(0)
+
 input_file = os.path.join(orbitize.DATADIR, "GJ504.csv")
 input_file_1epoch = os.path.join(orbitize.DATADIR, "GJ504_1epoch.csv")
 input_file_rvs = os.path.join(orbitize.DATADIR, "HD4747.csv")