diff --git a/src/viur/core/bones/base.py b/src/viur/core/bones/base.py
index 502329fa8..54daabadf 100644
--- a/src/viur/core/bones/base.py
+++ b/src/viur/core/bones/base.py
@@ -1207,6 +1207,8 @@ def getUniquePropertyIndexValues(self, skel: 'viur.core.skeleton.SkeletonInstanc
         :return: A list of strings representing the hashed values for the current bone value(s) in the skeleton.
                 If the bone has no value, an empty list is returned.
         """
+        if self.compute:
+            self.serialize_compute(skel, name)
         val = skel[name]
         if val is None:
             return []