diff --git a/internal/eventstore/handler/v2/statement.go b/internal/eventstore/handler/v2/statement.go
index 961881d24b..a02e5d3580 100644
--- a/internal/eventstore/handler/v2/statement.go
+++ b/internal/eventstore/handler/v2/statement.go
@@ -601,6 +601,12 @@ func NewCond(name string, value interface{}) Condition {
 	}
 }
 
+func NewUnequalCond(name string, value any) Condition {
+	return func(param string) (string, []any) {
+		return name + " <> " + param, []any{value}
+	}
+}
+
 func NewNamespacedCondition(name string, value interface{}) NamespacedCondition {
 	return func(namespace string) Condition {
 		return NewCond(namespace+"."+name, value)
diff --git a/internal/query/projection/project_grant.go b/internal/query/projection/project_grant.go
index 621623e061..d5a075c486 100644
--- a/internal/query/projection/project_grant.go
+++ b/internal/query/projection/project_grant.go
@@ -283,6 +283,7 @@ func (p *projectGrantProjection) reduceOwnerCorrected(event eventstore.Event) (*
 		[]handler.Condition{
 			handler.NewCond(ProjectGrantColumnInstanceID, event.Aggregate().InstanceID),
 			handler.NewCond(ProjectGrantColumnProjectID, event.Aggregate().ID),
+			handler.NewUnequalCond(ProjectGrantColumnResourceOwner, event.Aggregate().ResourceOwner),
 		},
 	), nil
 }