diff --git a/src/cpu/StaticInstFlags.py b/src/cpu/StaticInstFlags.py
index 4ab6cc499c..2e02833d1a 100644
--- a/src/cpu/StaticInstFlags.py
+++ b/src/cpu/StaticInstFlags.py
@@ -99,4 +99,5 @@ class StaticInstFlags(Enum):
         "IsHtmStart",  # Starts a HTM transaction
         "IsHtmStop",  # Stops (commits) a HTM transaction
         "IsHtmCancel",  # Explicitely aborts a HTM transaction
+        "IsInvalid",  # An invalid instruction
     ]
diff --git a/src/cpu/static_inst.hh b/src/cpu/static_inst.hh
index 12b05f9b0e..78e47f4ed8 100644
--- a/src/cpu/static_inst.hh
+++ b/src/cpu/static_inst.hh
@@ -196,6 +196,8 @@ class StaticInst : public RefCounted, public StaticInstFlags
     bool isHtmStop() const { return flags[IsHtmStop]; }
     bool isHtmCancel() const { return flags[IsHtmCancel]; }
 
+    bool isInvalid() const { return flags[IsInvalid]; }
+
     bool
     isHtmCmd() const
     {