diff --git a/src/cpu/static_inst.hh b/src/cpu/static_inst.hh
index e5d9753fea..25a49b328c 100644
--- a/src/cpu/static_inst.hh
+++ b/src/cpu/static_inst.hh
@@ -88,20 +88,13 @@ class StaticInst : public RefCounted, public StaticInstFlags
     /// Binary extended machine instruction type.
     typedef TheISA::ExtMachInst ExtMachInst;
 
-    enum {
-        MaxInstSrcRegs = TheISA::MaxInstSrcRegs,        //< Max source regs
-        MaxInstDestRegs = TheISA::MaxInstDestRegs       //< Max dest regs
-    };
-
     using RegIdArrayPtr = RegId (StaticInst:: *)[];
 
   private:
     /// See srcRegIdx().
-    RegId _srcRegIdx[MaxInstSrcRegs];
     RegIdArrayPtr _srcRegIdxPtr = nullptr;
 
     /// See destRegIdx().
-    RegId _destRegIdx[MaxInstDestRegs];
     RegIdArrayPtr _destRegIdxPtr = nullptr;
 
   protected:
@@ -309,11 +302,7 @@ class StaticInst : public RefCounted, public StaticInstFlags
     /// the fields that are meaningful for the particular
     /// instruction.
     StaticInst(const char *_mnemonic, ExtMachInst _machInst, OpClass __opClass)
-        : _srcRegIdxPtr(
-                reinterpret_cast<RegIdArrayPtr>(&StaticInst::_srcRegIdx)),
-          _destRegIdxPtr(
-                reinterpret_cast<RegIdArrayPtr>(&StaticInst::_destRegIdx)),
-          _opClass(__opClass),
+        : _opClass(__opClass),
           _numSrcRegs(0), _numDestRegs(0), _numFPDestRegs(0),
           _numIntDestRegs(0), _numCCDestRegs(0), _numVecDestRegs(0),
           _numVecElemDestRegs(0), _numVecPredDestRegs(0), machInst(_machInst),