diff --git a/src/jit/compiler.h b/src/jit/compiler.h
index b4ab2db0c404..d8f3a8bc818c 100644
--- a/src/jit/compiler.h
+++ b/src/jit/compiler.h
@@ -1446,8 +1446,7 @@ struct fgArgTabEntry
 #endif
     }
 
-    __declspec(property(get = getIsVararg, put = setIsVararg)) bool isVararg;
-    bool getIsVararg()
+    bool GetIsVararg()
     {
 #ifdef FEATURE_VARARG
         return _isVararg;
@@ -1455,7 +1454,7 @@ struct fgArgTabEntry
         return false;
 #endif
     }
-    void setIsVararg(bool value)
+    void SetIsVararg(bool value)
     {
 #ifdef FEATURE_VARARG
         _isVararg = value;
diff --git a/src/jit/morph.cpp b/src/jit/morph.cpp
index b318092ff00d..259e4dcde15d 100644
--- a/src/jit/morph.cpp
+++ b/src/jit/morph.cpp
@@ -1131,7 +1131,7 @@ fgArgTabEntry* fgArgInfo::AddRegArg(unsigned          argNum,
     curArgTabEntry->isBackFilled  = false;
     curArgTabEntry->isNonStandard = false;
     curArgTabEntry->isStruct      = isStruct;
-    curArgTabEntry->isVararg      = isVararg;
+    curArgTabEntry->SetIsVararg(isVararg);
 
     hasRegArgs = true;
     AddArg(curArgTabEntry);
@@ -1213,7 +1213,7 @@ fgArgTabEntry* fgArgInfo::AddStkArg(unsigned          argNum,
     curArgTabEntry->isBackFilled  = false;
     curArgTabEntry->isNonStandard = false;
     curArgTabEntry->isStruct      = isStruct;
-    curArgTabEntry->isVararg      = isVararg;
+    curArgTabEntry->SetIsVararg(isVararg);
 
     hasStackArgs = true;
     AddArg(curArgTabEntry);
@@ -2080,7 +2080,7 @@ GenTree* Compiler::fgMakeTmpArgNode(fgArgTabEntry* curArgTabEntry)
         {
             CORINFO_CLASS_HANDLE clsHnd = varDsc->lvVerTypeInfo.GetClassHandle();
             var_types            structBaseType =
-                getPrimitiveTypeForStruct(lvaLclExactSize(tmpVarNum), clsHnd, curArgTabEntry->isVararg);
+                getPrimitiveTypeForStruct(lvaLclExactSize(tmpVarNum), clsHnd, curArgTabEntry->GetIsVararg());
 
             if (structBaseType != TYP_UNKNOWN)
             {
@@ -2123,7 +2123,7 @@ GenTree* Compiler::fgMakeTmpArgNode(fgArgTabEntry* curArgTabEntry)
 #if FEATURE_MULTIREG_ARGS
 #ifdef _TARGET_ARM64_
             assert(varTypeIsStruct(type));
-            if (lvaIsMultiregStruct(varDsc, curArgTabEntry->isVararg))
+            if (lvaIsMultiregStruct(varDsc, curArgTabEntry->GetIsVararg()))
             {
                 // ToDo-ARM64: Consider using:  arg->ChangeOper(GT_LCL_FLD);
                 // as that is how UNIX_AMD64_ABI works.
@@ -2288,7 +2288,7 @@ void fgArgInfo::EvalArgsToTemps()
                             unsigned             structSize = varDsc->lvExactSize;
 
                             scalarType =
-                                compiler->getPrimitiveTypeForStruct(structSize, clsHnd, curArgTabEntry->isVararg);
+                                compiler->getPrimitiveTypeForStruct(structSize, clsHnd, curArgTabEntry->GetIsVararg());
                         }
 #endif // _TARGET_ARMARCH_ || defined (UNIX_AMD64_ABI)
                     }
@@ -4529,9 +4529,9 @@ GenTree* Compiler::fgMorphMultiregStructArg(GenTree* arg, fgArgTabEntry* fgEntry
     hfaType = fgEntryPtr->hfaType;
     if (varTypeIsValidHfaType(hfaType)
 #if !defined(_HOST_UNIX_) && defined(_TARGET_ARM64_)
-        && !fgEntryPtr->isVararg
+        && !fgEntryPtr->GetIsVararg()
 #endif // !defined(_HOST_UNIX_) && defined(_TARGET_ARM64_)
-        )
+            )
     {
         elemType  = hfaType;
         elemSize  = genTypeSize(elemType);
@@ -4641,9 +4641,9 @@ GenTree* Compiler::fgMorphMultiregStructArg(GenTree* arg, fgArgTabEntry* fgEntry
         // This local variable must match the layout of the 'objClass' type exactly
         if (varDsc->lvIsHfa()
 #if !defined(_HOST_UNIX_) && defined(_TARGET_ARM64_)
-            && !fgEntryPtr->isVararg
+            && !fgEntryPtr->GetIsVararg()
 #endif // !defined(_HOST_UNIX_) && defined(_TARGET_ARM64_)
-            )
+                )
         {
             // We have a HFA struct.
             // Note that GetHfaType may not be the same as elemType, since TYP_SIMD8 is handled the same as TYP_DOUBLE.
@@ -4696,9 +4696,9 @@ GenTree* Compiler::fgMorphMultiregStructArg(GenTree* arg, fgArgTabEntry* fgEntry
         // TODO-ARM64-CQ: Support struct promoted HFA types here
         if (varDsc->lvPromoted && (varDsc->lvFieldCnt == 2) && (!varDsc->lvIsHfa()
 #if !defined(_HOST_UNIX_) && defined(_TARGET_ARM64_)
-                                                                && !fgEntryPtr->isVararg
+                                                                && !fgEntryPtr->GetIsVararg()
 #endif // !defined(_HOST_UNIX_) && defined(_TARGET_ARM64_)
-                                                                ))
+                                                                    ))
         {
             // See if we have two promoted fields that start at offset 0 and 8?
             unsigned loVarNum = lvaGetFieldLocal(varDsc, 0);