diff --git a/stackit/internal/services/rabbitmq/instance/resource.go b/stackit/internal/services/rabbitmq/instance/resource.go
index bf98d609d..32941ed58 100644
--- a/stackit/internal/services/rabbitmq/instance/resource.go
+++ b/stackit/internal/services/rabbitmq/instance/resource.go
@@ -517,7 +517,7 @@ func (r *instanceResource) Update(ctx context.Context, req resource.UpdateReques
 		return
 	}
 	// Update existing instance
-	err = r.client.DefaultAPI.PartialUpdateInstance(ctx, projectId, instanceId, region).PartialUpdateInstancePayload(*payload).Execute()
+	err = r.client.DefaultAPI.PartialUpdateInstance(ctx, projectId, region, instanceId).PartialUpdateInstancePayload(*payload).Execute()
 	if err != nil {
 		core.LogAndAddError(ctx, &resp.Diagnostics, "Error updating instance", fmt.Sprintf("Calling API: %v", err))
 		return
diff --git a/stackit/internal/services/redis/instance/resource.go b/stackit/internal/services/redis/instance/resource.go
index 4982d8d1f..3926b296b 100644
--- a/stackit/internal/services/redis/instance/resource.go
+++ b/stackit/internal/services/redis/instance/resource.go
@@ -586,7 +586,7 @@ func (r *instanceResource) Update(ctx context.Context, req resource.UpdateReques
 		return
 	}
 	// Update existing instance
-	err = r.client.DefaultAPI.PartialUpdateInstance(ctx, projectId, instanceId, region).PartialUpdateInstancePayload(*payload).Execute()
+	err = r.client.DefaultAPI.PartialUpdateInstance(ctx, projectId, region, instanceId).PartialUpdateInstancePayload(*payload).Execute()
 	if err != nil {
 		core.LogAndAddError(ctx, &resp.Diagnostics, "Error updating instance", fmt.Sprintf("Calling API: %v", err))
 		return