diff --git a/tests/test_xfel_calibrate/conftest.py b/tests/test_xfel_calibrate/conftest.py
index 84765fe4121b6922b5cd500d32c502f68e806a25..5d35fac3cbc7a174d7c3b4788086f87e5ed8fc03 100644
--- a/tests/test_xfel_calibrate/conftest.py
+++ b/tests/test_xfel_calibrate/conftest.py
@@ -48,6 +48,10 @@ class FakeProcessCalibrate(FakeProcess):
         self.register_subprocess(
             [self.any(), '-m', 'pip', 'freeze'], stdout=["h5py==3.3.0"],
         )
+        # For getting Python version from user venv
+        self.register_subprocess(
+            [self.any(), '--version'], stdout=["Python 3.x.y"]
+        )
 
         self.keep_last_process(True)