diff --git a/src/arch/alpha/isa/decoder.isa b/src/arch/alpha/isa/decoder.isa
index f0aa5a3fd7..3cc2a1006b 100644
--- a/src/arch/alpha/isa/decoder.isa
+++ b/src/arch/alpha/isa/decoder.isa
@@ -935,7 +935,7 @@ decode OPCODE default Unknown::unknown() {
   0x1e: decode PALMODE {
       0: OpcdecFault::hw_rei();
         format BasicOperate {
-          1: hw_rei({{ xc->hwrei(); }}, IsSerializing, IsSerializeBefore);
+          1: hw_rei({{ xc->hwrei(); }}, IsSerializing, IsSerializeBefore, IsControl);
         }
     }