diff --git a/src/ifcopenshell-python/ifcopenshell/util/system.py b/src/ifcopenshell-python/ifcopenshell/util/system.py
index ef84be03c5..833d85a941 100644
--- a/src/ifcopenshell-python/ifcopenshell/util/system.py
+++ b/src/ifcopenshell-python/ifcopenshell/util/system.py
@@ -66,7 +66,7 @@ def get_system_elements(system: ifcopenshell.entity_instance) -> list[ifcopenshe
 def get_element_systems(element: ifcopenshell.entity_instance) -> list[ifcopenshell.entity_instance]:
     results = []
     for rel in element.HasAssignments:
-        if rel.is_a("IfcRelAssignsToGroup"):
+        if not rel.is_a("IfcRelAssignsToGroup"):
             continue
         group = rel.RelatingGroup
         if not group.is_a("IfcSystem") or group.is_a() in ("IfcStructuralAnalysisModel", "IfcZone"):