diff --git a/tinyxml2.h b/tinyxml2.h
index c7d4070..f9fd093 100755
--- a/tinyxml2.h
+++ b/tinyxml2.h
@@ -625,7 +625,7 @@
     static bool	ToFloat( const char* str, float* value );
     static bool ToDouble( const char* str, double* value );
 	static bool ToInt64(const char* str, int64_t* value);
-
+    static bool ToUnsigned64(const char* str, uint64_t* value);
 	// Changes what is serialized for a boolean value.
 	// Default to "true" and "false". Shouldn't be changed
 	// unless you have a special testing or compatibility need.
@@ -1164,6 +1164,12 @@
 		return i;
 	}
 
+    uint64_t Unsigned64Value() const {
+        uint64_t i = 0;
+        QueryUnsigned64Value(&i);
+        return i;
+    }
+
     /// Query as an unsigned integer. See IntValue()
     unsigned UnsignedValue() const			{
         unsigned i=0;
@@ -1198,6 +1204,8 @@
     XMLError QueryUnsignedValue( unsigned int* value ) const;
 	/// See QueryIntValue
 	XMLError QueryInt64Value(int64_t* value) const;
+    /// See QueryIntValue
+    XMLError QueryUnsigned64Value(uint64_t* value) const;
 	/// See QueryIntValue
     XMLError QueryBoolValue( bool* value ) const;
     /// See QueryIntValue
@@ -1301,6 +1309,8 @@
 	unsigned UnsignedAttribute(const char* name, unsigned defaultValue = 0) const;
 	/// See IntAttribute()
 	int64_t Int64Attribute(const char* name, int64_t defaultValue = 0) const;
+    /// See IntAttribute()
+    uint64_t Unsigned64Attribute(const char* name, uint64_t defaultValue = 0) const;
 	/// See IntAttribute()
 	bool BoolAttribute(const char* name, bool defaultValue = false) const;
     /// See IntAttribute()
@@ -1347,6 +1357,15 @@
 		return a->QueryInt64Value(value);
 	}
 
+    /// See QueryIntAttribute()
+    XMLError QueryUnsigned64Attribute(const char* name, uint64_t* value) const {
+        const XMLAttribute* a = FindAttribute(name);
+        if(!a) {
+            return XML_NO_ATTRIBUTE;
+        }
+        return a->QueryUnsigned64Value(value);
+    }
+
 	/// See QueryIntAttribute()
     XMLError QueryBoolAttribute( const char* name, bool* value ) const				{
         const XMLAttribute* a = FindAttribute( name );