diff --git a/src/arch/mips/isa/decoder.isa b/src/arch/mips/isa/decoder.isa
index 339ca868c..68a63a458 100644
--- a/src/arch/mips/isa/decoder.isa
+++ b/src/arch/mips/isa/decoder.isa
@@ -140,7 +140,7 @@ decode OPCODE_HI default Unknown::unknown() {
                                  }});
 #else
                     0x4: syscall({{ xc->syscall(R2); }},
-                                 IsSerializing, IsNonSpeculative);
+                                 IsSerializeAfter, IsNonSpeculative);
 #endif
                     0x7: sync({{ ; }}, IsMemBarrier);
                     0x5: break({{fault = new BreakpointFault();}});