diff --git a/source/gameengine/Expressions/Value.cpp b/source/gameengine/Expressions/Value.cpp
index 97b4f3951b3..ecbd2d9d6d8 100644
--- a/source/gameengine/Expressions/Value.cpp
+++ b/source/gameengine/Expressions/Value.cpp
@@ -284,7 +284,7 @@ void CValue::SetProperty(const STR_String & name,CValue* ioProperty)
 
 	// Make sure we have a property array
 	if (m_pNamedPropertyArray == NULL)
-		m_pNamedPropertyArray = new std::map<const STR_String,CValue *>;
+		m_pNamedPropertyArray = new std::map<STR_String,CValue *>;
 
 	// Try to replace property (if so -> exit as soon as we replaced it)
 	CValue* oldval = (*m_pNamedPropertyArray)[name];
@@ -308,7 +308,7 @@ CValue* CValue::GetProperty(const STR_String & inName)
 	CValue* result = NULL;
 	if (m_pNamedPropertyArray)
 	{
-		std::map<const STR_String,CValue*>::iterator it = (*m_pNamedPropertyArray).find(inName);
+		std::map<STR_String,CValue*>::iterator it = (*m_pNamedPropertyArray).find(inName);
 		if (!( it==m_pNamedPropertyArray->end()))
 		{
 			result = (*it).second;
@@ -376,7 +376,7 @@ void CValue::ClearProperties()
 		return;
 
 	// Remove all properties
-	for ( std::map<const STR_String,CValue*>::iterator it = m_pNamedPropertyArray->begin();
+	for ( std::map<STR_String,CValue*>::iterator it = m_pNamedPropertyArray->begin();
 	!(it == m_pNamedPropertyArray->end());it++)
 	{
 		CValue* tmpval = (*it).second;
@@ -430,7 +430,7 @@ CValue* CValue::GetProperty(int inIndex)
 
 	if (m_pNamedPropertyArray)
 	{
-		for ( std::map<const STR_String,CValue*>::iterator it = m_pNamedPropertyArray->begin();
+		for ( std::map<STR_String,CValue*>::iterator it = m_pNamedPropertyArray->begin();
 		!(it == m_pNamedPropertyArray->end());it++)
 		{
 			if (count++==inIndex)
@@ -467,7 +467,7 @@ void CValue::CloneProperties(CValue *replica)
 	if (m_pNamedPropertyArray)
 	{
 		replica->m_pNamedPropertyArray=NULL;
-		for ( std::map<const STR_String,CValue*>::iterator it = m_pNamedPropertyArray->begin();
+		for ( std::map<STR_String,CValue*>::iterator it = m_pNamedPropertyArray->begin();
 		!(it == m_pNamedPropertyArray->end());it++)
 		{
 			
diff --git a/source/gameengine/Expressions/Value.h b/source/gameengine/Expressions/Value.h
index ba394814fa7..527dfa85d39 100644
--- a/source/gameengine/Expressions/Value.h
+++ b/source/gameengine/Expressions/Value.h
@@ -357,7 +357,7 @@ protected:
 	virtual				~CValue();
 private:																		
 	// Member variables															
-	std::map<const STR_String,CValue*>*		m_pNamedPropertyArray;									// Properties for user/game etc
+	std::map<STR_String,CValue*>*		m_pNamedPropertyArray;									// Properties for user/game etc
 	ValueFlags			m_ValFlags;												// Frequently used flags in a bitfield (low memoryusage)
 	int					m_refcount;												// Reference Counter	
 	static	double m_sZeroVec[3];