diff --git a/src/panfrost/bifrost/ISA.xml b/src/panfrost/bifrost/ISA.xml
index 39f3c2e54c5..8c930aa82e9 100644
--- a/src/panfrost/bifrost/ISA.xml
+++ b/src/panfrost/bifrost/ISA.xml
@@ -3710,6 +3710,7 @@
       <opt>subgroup2</opt>
       <opt>subgroup4</opt>
       <opt>subgroup8</opt>
+      <opt pseudo="true">subgroup16</opt> <!-- Only on Valhall -->
     </mod>
     <mod name="inactive_result" start="10" size="4">
       <opt>zero</opt>