diff --git a/src/compiler/nir/nir.h b/src/compiler/nir/nir.h
index f05ff449882..073e6635e9f 100644
--- a/src/compiler/nir/nir.h
+++ b/src/compiler/nir/nir.h
@@ -1210,7 +1210,7 @@ typedef struct {
     *
     * Ignored if dest.is_ssa is true
     */
-   unsigned write_mask : NIR_MAX_VEC_COMPONENTS;
+   nir_component_mask_t write_mask;
 } nir_alu_dest;
 
 /** NIR sized and unsized types