diff --git a/tests/utils.py b/tests/utils.py
index 6b4cd75d..d275f3a8 100644
--- a/tests/utils.py
+++ b/tests/utils.py
@@ -878,6 +878,9 @@ def detectTestSources(exposure, addMaskPlanes=None):
         addMaskPlanes = ["STREAK", "INJECTED", "INJECTED_TEMPLATE"]
 
     schema = afwTable.SourceTable.makeMinimalSchema()
+
+    # Add coordinate error fields:
+    afwTable.CoordKey.addErrorFields(schema)
     selectDetection = measAlg.SourceDetectionTask(schema=schema)
     selectMeasurement = measBase.SingleFrameMeasurementTask(schema=schema)
     table = afwTable.SourceTable.make(schema)