diff --git a/src/arch/arm/isa/insts/misc.isa b/src/arch/arm/isa/insts/misc.isa
index ae8474f..5fd18c4 100644
--- a/src/arch/arm/isa/insts/misc.isa
+++ b/src/arch/arm/isa/insts/misc.isa
@@ -1154,7 +1154,7 @@
     isbIop = InstObjParams("isb", "Isb", "ImmOp",
                              {"code": isbCode,
                                "predicate_test": predicateTest},
-                                ['IsSerializeAfter', 'IsSquashAfter'])
+                                ['IsSquashAfter'])
     header_output += ImmOpDeclare.subst(isbIop)
     decoder_output += ImmOpConstructor.subst(isbIop)
     exec_output += PredOpExecute.subst(isbIop)
diff --git a/src/arch/arm/isa/insts/misc64.isa b/src/arch/arm/isa/insts/misc64.isa
index dd6711e..2483b75 100644
--- a/src/arch/arm/isa/insts/misc64.isa
+++ b/src/arch/arm/isa/insts/misc64.isa
@@ -140,7 +140,7 @@
     exec_output += BasicExecute.subst(unknown64Iop)
 
     isbIop = InstObjParams("isb", "Isb64", "ArmStaticInst", "",
-                           ['IsSerializeAfter', 'IsSquashAfter'])
+                           ['IsSquashAfter'])
     header_output += BasicDeclare.subst(isbIop)
     decoder_output += BasicConstructor64.subst(isbIop)
     exec_output += BasicExecute.subst(isbIop)