diff --git a/common/icat/filters.py b/common/icat/filters.py
index bd6a11bc..e2037c86 100644
--- a/common/icat/filters.py
+++ b/common/icat/filters.py
@@ -74,8 +74,11 @@ def create_condition(attribute_name, operator, value):
         # Removing quote marks when doing conditions with IN expressions or when a
         # distinct filter is used in a request
         jpql_value = (
-            f"{value}" if operator == "in" or operator == "!=" else f"'{value}'"
+            f"{value}"
+            if operator == "in" or operator == "!=" or "o." in str(value)
+            else f"'{value}'"
         )
+
         conditions[attribute_name] = f"{operator} {jpql_value}"
         log.debug("Conditions in ICAT where filter, %s", conditions)
         return conditions