diff --git a/src/arch/x86/isa/formats/syscall.isa b/src/arch/x86/isa/formats/syscall.isa
index 8b860dba4..2f88c8d23 100644
--- a/src/arch/x86/isa/formats/syscall.isa
+++ b/src/arch/x86/isa/formats/syscall.isa
@@ -65,6 +65,7 @@ output header {{
     class SyscallInst : public X86ISA::X86StaticInst
     {
       public:
+        static const RegIndex foldOBit = 0;
         /// Constructor
         SyscallInst(const char *_mnemonic, ExtMachInst _machInst,
                 OpClass __opClass) :