diff --git a/oscar64/GlobalOptimizer.cpp b/oscar64/GlobalOptimizer.cpp
index e23e8a8..3df1ce0 100644
--- a/oscar64/GlobalOptimizer.cpp
+++ b/oscar64/GlobalOptimizer.cpp
@@ -275,14 +275,22 @@ bool GlobalOptimizer::ReplaceGlobalConst(Expression* exp)
 	{
 		if (exp->mType == EX_VARIABLE && (exp->mDecValue->mFlags & (DTF_GLOBAL | DTF_STATIC)) && !(exp->mDecValue->mOptFlags & (OPTF_VAR_MODIFIED | OPTF_VAR_ADDRESS)) && exp->mDecValue->mValue)
 		{
+
 			Expression* cexp = exp->mDecValue->mValue;
-			if (cexp->mType == EX_CONSTANT && 
-				(cexp->mDecValue->mType == DT_CONST_ADDRESS || cexp->mDecValue->mType == DT_CONST_INTEGER || 
-				 cexp->mDecValue->mType == DT_CONST_POINTER || cexp->mDecValue->mType == DT_CONST_FLOAT))
+			if (cexp->mType == EX_CONSTANT)
 			{
-				exp->mType = EX_CONSTANT;				
-				exp->mDecValue = cexp->mDecValue->ConstCast(exp->mDecType);
-				changed = true;
+
+				if (cexp->mDecValue->mType == DT_CONST_ADDRESS || cexp->mDecValue->mType == DT_CONST_INTEGER ||
+					cexp->mDecValue->mType == DT_CONST_POINTER || cexp->mDecValue->mType == DT_CONST_FLOAT)
+				{
+					exp->mType = EX_CONSTANT;
+					exp->mDecValue = cexp->mDecValue->ConstCast(exp->mDecType);
+					changed = true;
+				}
+				else if (exp->mDecValue->mBase->mType == DT_TYPE_STRUCT)
+				{
+					exp->mDecValue->mBase = exp->mDecValue->mBase->ToConstType();
+				}
 			}
 		}