diff --git a/src/panfrost/bifrost/valhall/ISA.xml b/src/panfrost/bifrost/valhall/ISA.xml
index 5b5229df17a..fd811496e6d 100644
--- a/src/panfrost/bifrost/valhall/ISA.xml
+++ b/src/panfrost/bifrost/valhall/ISA.xml
@@ -705,7 +705,7 @@
     <slot/>
     <src/>
     <src/>
-    <imm name="index" start="20" size="4"/>
+    <imm name="index" start="16" size="8"/>
   </group>
 
   <ins name="LD_ATTR_IMM" title="Load immediate attribute" opcode="0x66" unit="LS">