diff --git a/src/gallium/drivers/zink/zink_pipeline.h b/src/gallium/drivers/zink/zink_pipeline.h
index 22023a2ae08..2a171a2163e 100644
--- a/src/gallium/drivers/zink/zink_pipeline.h
+++ b/src/gallium/drivers/zink/zink_pipeline.h
@@ -79,7 +79,7 @@ struct zink_gfx_pipeline_state {
    bool have_EXT_extended_dynamic_state;
 
    VkPipeline pipeline;
-   enum pipe_prim_type mode;
+   enum pipe_prim_type mode : 8;
 };
 
 struct zink_compute_pipeline_state {