diff --git a/libs/vkd3d-shader/ir.c b/libs/vkd3d-shader/ir.c
index 6f932c89..80f1417a 100644
--- a/libs/vkd3d-shader/ir.c
+++ b/libs/vkd3d-shader/ir.c
@@ -7257,6 +7257,10 @@ static void vsir_validate_register(struct validation_context *ctx,
             vsir_validate_register_without_indices(ctx, reg);
             break;
 
+        case VKD3DSPR_SAMPLEMASK:
+            vsir_validate_register_without_indices(ctx, reg);
+            break;
+
         case VKD3DSPR_DEPTHOUTGE:
             vsir_validate_register_without_indices(ctx, reg);
             break;