diff --git a/pkg/models/task_search.go b/pkg/models/task_search.go
index 7c6118a14..d77f2b463 100644
--- a/pkg/models/task_search.go
+++ b/pkg/models/task_search.go
@@ -489,7 +489,7 @@ func convertParsedFilterToTypesense(rawFilters []*taskFilter) (filterBy string,
 		case taskFilterComparatorIn:
 			filter += ":["
 		case taskFilterComparatorNotIn:
-			filter += ":!["
+			filter += ":!=["
 		case taskFilterComparatorInvalid:
 		// Nothing to do
 		default: