diff --git a/src/arch/x86/isa/decoder/one_byte_opcodes.isa b/src/arch/x86/isa/decoder/one_byte_opcodes.isa
index 213ddf65af..71d1612319 100644
--- a/src/arch/x86/isa/decoder/one_byte_opcodes.isa
+++ b/src/arch/x86/isa/decoder/one_byte_opcodes.isa
@@ -403,7 +403,7 @@
                 0x5: decode IMMEDIATE {
                     -0x80:
                          SyscallInst::int80('xc->syscall(Rax)',
-                                 IsSyscall, IsNonSpeculative);
+                                 IsSyscall, IsNonSpeculative, IsSerializeAfter);
                     default: int_Ib();
                 }
 #endif
diff --git a/src/arch/x86/isa/decoder/two_byte_opcodes.isa b/src/arch/x86/isa/decoder/two_byte_opcodes.isa
index 27824c8aaf..de167d1c1d 100644
--- a/src/arch/x86/isa/decoder/two_byte_opcodes.isa
+++ b/src/arch/x86/isa/decoder/two_byte_opcodes.isa
@@ -229,7 +229,7 @@
                 }
 #else
                 0x05: SyscallInst::syscall('xc->syscall(Rax)',
-                              IsSyscall, IsNonSpeculative);
+                              IsSyscall, IsNonSpeculative, IsSerializeAfter);
 #endif
                 0x06: Inst::CLTS();
                 0x07: decode MODE_SUBMODE {
@@ -406,7 +406,7 @@
                 0x4: sysenter();
 #else
                 0x4: SyscallInst::sysenter('xc->syscall(Rax)',
-                             IsSyscall, IsNonSpeculative);
+                             IsSyscall, IsNonSpeculative, IsSerializeAfter);
 #endif
                 0x5: sysexit();
                 0x6: Inst::UD2();