diff --git a/src/gallium/drivers/iris/iris_state.c b/src/gallium/drivers/iris/iris_state.c
index 1f354bc3bee..7d945ecec9e 100644
--- a/src/gallium/drivers/iris/iris_state.c
+++ b/src/gallium/drivers/iris/iris_state.c
@@ -5048,7 +5048,7 @@ iris_upload_dirty_render_state(struct iris_context *ice,
              BRW_BARYCENTRIC_NONPERSPECTIVE_BITS)
             cl.NonPerspectiveBarycentricEnable = true;
 
-         cl.ForceZeroRTAIndexEnable = cso_fb->layers == 0;
+         cl.ForceZeroRTAIndexEnable = cso_fb->layers <= 1;
          cl.MaximumVPIndex = ice->state.num_viewports - 1;
       }
       iris_emit_merge(batch, cso_rast->clip, dynamic_clip,