diff --git a/oscar64/Declaration.cpp b/oscar64/Declaration.cpp
index dd0ed8d..632aabc 100644
--- a/oscar64/Declaration.cpp
+++ b/oscar64/Declaration.cpp
@@ -979,7 +979,7 @@ Declaration::Declaration(const Location& loc, DecType type)
 	: mLocation(loc), mEndLocation(loc), mType(type), mScope(nullptr), mData(nullptr), mIdent(nullptr), mQualIdent(nullptr), mMangleIdent(nullptr),
 	mSize(0), mOffset(0), mFlags(0), mComplexity(0), mLocalSize(0), mNumVars(0),
 	mBase(nullptr), mParams(nullptr), mParamPack(nullptr), mValue(nullptr), mReturn(nullptr), mNext(nullptr), mPrev(nullptr),
-	mConst(nullptr), mMutable(nullptr),
+	mConst(nullptr), mMutable(nullptr), mVolatile(nullptr),
 	mDefaultConstructor(nullptr), mDestructor(nullptr), mCopyConstructor(nullptr), mCopyAssignment(nullptr), mMoveConstructor(nullptr), mMoveAssignment(nullptr),
 	mVectorConstructor(nullptr), mVectorDestructor(nullptr), mVectorCopyConstructor(nullptr), mVectorCopyAssignment(nullptr),
 	mVTable(nullptr), mTemplate(nullptr), mForwardParam(nullptr), mForwardCall(nullptr),
@@ -1859,6 +1859,59 @@ Declaration* Declaration::ToStriped(int stripe)
 	return ndec;
 }
 
+Declaration* Declaration::ToVolatileType(void)
+{
+	if (mFlags & DTF_VOLATILE)
+		return this;
+
+	if (!mVolatile)
+	{
+		Declaration* ndec = new Declaration(mLocation, mType);
+		ndec->mSize = mSize;
+		ndec->mStride = mStride;
+		ndec->mBase = mBase;
+		ndec->mFlags = mFlags | DTF_VOLATILE;
+		ndec->mScope = mScope;
+		ndec->mParams = mParams;
+		ndec->mIdent = mIdent;
+		ndec->mQualIdent = mQualIdent;
+		ndec->mTemplate = mTemplate;
+
+		if (mType == DT_TYPE_STRUCT)
+		{
+			ndec->mScope = new DeclarationScope(nullptr, mScope->mLevel);
+			Declaration* p = mParams;
+			Declaration* prev = nullptr;
+			while (p)
+			{
+				Declaration* pnec = p->Clone();
+				pnec->mBase = pnec->mBase->ToVolatileType();
+
+				ndec->mScope->Insert(pnec->mIdent, pnec);
+
+				if (prev)
+					prev->mNext = pnec;
+				else
+					ndec->mParams = pnec;
+				prev = pnec;
+				p = p->mNext;
+			}
+		}
+
+		ndec->mDestructor = mDestructor;
+		ndec->mDefaultConstructor = mDefaultConstructor;
+		ndec->mCopyConstructor = mCopyConstructor;
+		ndec->mMoveConstructor = mMoveConstructor;
+		ndec->mVectorConstructor = mVectorConstructor;
+		ndec->mVectorCopyConstructor = mVectorCopyConstructor;
+		ndec->mVTable = mVTable;
+
+		mVolatile = ndec;
+	}
+
+	return mVolatile;
+}
+
 Declaration* Declaration::ToConstType(void)
 {
 	if (mFlags & DTF_CONST)
diff --git a/oscar64/Declaration.h b/oscar64/Declaration.h
index f4accaa..734a3c0 100644
--- a/oscar64/Declaration.h
+++ b/oscar64/Declaration.h
@@ -267,7 +267,7 @@ public:
 	Location			mLocation, mEndLocation;
 	DecType				mType;
 	Token				mToken;
-	Declaration		*	mBase, * mParams, * mParamPack, * mNext, * mPrev, * mConst, * mMutable;
+	Declaration		*	mBase, * mParams, * mParamPack, * mNext, * mPrev, * mConst, * mMutable, * mVolatile;
 	Declaration		*	mDefaultConstructor, * mDestructor, * mCopyConstructor, * mCopyAssignment, * mMoveConstructor, * mMoveAssignment;
 	Declaration		*	mVectorConstructor, * mVectorDestructor, * mVectorCopyConstructor, * mVectorCopyAssignment;
 	Declaration		*	mVTable, * mClass, * mTemplate;
@@ -315,6 +315,7 @@ public:
 
 	Declaration* ToConstType(void);
 	Declaration* ToMutableType(void);
+	Declaration* ToVolatileType(void);
 
 	Declaration* ToStriped(int stripe);
 	Declaration* ToStriped(Errors* errors);
diff --git a/oscar64/Parser.cpp b/oscar64/Parser.cpp
index 700f925..8c59050 100644
--- a/oscar64/Parser.cpp
+++ b/oscar64/Parser.cpp
@@ -648,6 +648,13 @@ Declaration* Parser::ParseStructDeclaration(uint64 flags, DecType dt, Declaratio
 
 		mScope = oscope;
 	}
+	else
+	{
+		if ((flags & ~dec->mFlags) == DTF_CONST)
+			dec = dec->ToConstType();
+		else if ((flags & ~dec->mFlags) == DTF_VOLATILE)
+			dec = dec->ToVolatileType();
+	}
 
 	return dec;
 }
@@ -820,6 +827,8 @@ Declaration* Parser::ParseBaseTypeDeclaration(uint64 flags, bool qualified, Decl
 			{
 				if ((flags & ~dec->mFlags) == DTF_CONST)
 					dec = dec->ToConstType();
+				else if ((flags & ~dec->mFlags) == DTF_VOLATILE)
+					dec = dec->ToVolatileType();
 				else if (dec->IsSimpleType() && (flags & ~dec->mFlags))
 				{
 					Declaration* ndec = new Declaration(dec->mLocation, dec->mType);
@@ -832,6 +841,8 @@ Declaration* Parser::ParseBaseTypeDeclaration(uint64 flags, bool qualified, Decl
 				{
 					if ((flags & ~dec->mFlags) == DTF_CONST)
 						dec = dec->ToConstType();
+					else if ((flags & ~dec->mFlags) == DTF_VOLATILE)
+						dec = dec->ToVolatileType();
 					else
 					{
 						Declaration* ndec = new Declaration(dec->mLocation, dec->mType);