diff --git a/src/ifcopenshell-python/ifcopenshell/util/selector.py b/src/ifcopenshell-python/ifcopenshell/util/selector.py
index f83d3cd3d5..da86b69a91 100644
--- a/src/ifcopenshell-python/ifcopenshell/util/selector.py
+++ b/src/ifcopenshell-python/ifcopenshell/util/selector.py
@@ -1242,7 +1242,13 @@ class FacetTransformer(lark.Transformer):
 
     def compare(self, element_value, comparison, value) -> bool:
         if isinstance(element_value, (list, tuple)):
-            return any(self.compare(ev, comparison, value) for ev in element_value)
+            # Match if any item does, negating the aggregate rather than each
+            # item, so that e.g. != means "no item equals" and stays the
+            # complement of = (#8129).
+            result = any(self.compare(ev, comparison.lstrip("!"), value) for ev in element_value)
+            if comparison.startswith("!"):
+                return not result
+            return result
         elif isinstance(value, str):
             try:
                 if isinstance(element_value, int):
diff --git a/src/ifcopenshell-python/test/util/test_selector.py b/src/ifcopenshell-python/test/util/test_selector.py
index 5ee2267269..af80141e81 100644
--- a/src/ifcopenshell-python/test/util/test_selector.py
+++ b/src/ifcopenshell-python/test/util/test_selector.py
@@ -279,6 +279,12 @@ class TestFilterElements(test.bootstrap.IFC4):
         pset = ifcopenshell.api.pset.add_pset(self.file, product=element, name="Pset_WallCommon")
         ifcopenshell.api.pset.edit_pset(self.file, pset=pset, properties={"Status": ["New"]})
         assert subject.filter_elements(self.file, "IfcWall, Pset_WallCommon.Status=New") == {element}
+        # On multi-valued properties, != means "no value equals" and stays the
+        # complement of = (#8129).
+        ifcopenshell.api.pset.edit_pset(self.file, pset=pset, properties={"Status": ["New", "Demolish"]})
+        assert subject.filter_elements(self.file, "IfcWall, Pset_WallCommon.Status=New") == {element}
+        assert subject.filter_elements(self.file, "IfcWall, Pset_WallCommon.Status!=New") == {element2}
+        assert subject.filter_elements(self.file, "IfcWall, Pset_WallCommon.Status!=Temporary") == {element, element2}
 
     def test_selecting_by_property_with_comparisons(self):
         element = ifcopenshell.api.root.create_entity(self.file, ifc_class="IfcWall")