diff --git a/src/caosdb/apiutils.py b/src/caosdb/apiutils.py
index a954535b3dc7c18087f3bcec3abbce2242cc9b76..36989dc7e3aebe00c4764dbe66859138e377a252 100644
--- a/src/caosdb/apiutils.py
+++ b/src/caosdb/apiutils.py
@@ -748,6 +748,7 @@ def merge_entities(entity_a: Entity, entity_b: Entity):
                                   name=entity_b.get_property(key).name,
                                   datatype=entity_b.get_property(key).datatype,
                                   value=entity_b.get_property(key).value,
+                                  unit=entity_b.get_property(key).unit,
                                   importance=entity_b.get_importance(key))
             # entity_a.add_property(
             #     entity_b.get_property(key),