diff --git a/Foundation/include/Poco/Dynamic/Var.h b/Foundation/include/Poco/Dynamic/Var.h
index 475f9f3f6..290df9076 100644
--- a/Foundation/include/Poco/Dynamic/Var.h
+++ b/Foundation/include/Poco/Dynamic/Var.h
@@ -435,8 +435,8 @@ public:
 			return holderImpl<std::vector<Var>,
 				InvalidAccessException>("Not an array.")->operator[](n);
 		else if (isStruct())
-			return holderImpl<Struct<int>,
-				InvalidAccessException>("Not a struct.")->operator[](n);
+			return structIndexOperator(holderImpl<Struct<int>,
+				InvalidAccessException>("Not a struct."), n);
 		else
 			throw InvalidAccessException("Must be struct or array.");
 	}
@@ -447,11 +447,11 @@ public:
 		/// returns true! In all other cases InvalidAccessException is thrown.
 	{
 		if (isArray())
-			return const_cast<const Var&>(holderImpl<std::vector<Var>,
-				InvalidAccessException>("Not an array.")->operator[](n));
+			return holderImpl<std::vector<Var>,
+				InvalidAccessException>("Not an array.")->operator[](n);
 		else if (isStruct())
-			return const_cast<const Var&>(holderImpl<Struct<int>,
-				InvalidAccessException>("Not a struct.")->operator[](n));
+			return structIndexOperator(holderImpl<Struct<int>,
+				InvalidAccessException>("Not a struct."), n);
 		else
 			throw InvalidAccessException("Must be struct or array.");
 	}
@@ -545,6 +545,8 @@ private:
 			throw E(errorMessage);
 	}
 
+	Var& structIndexOperator(VarHolderImpl<Struct<int> >* pStr, int n) const;
+
 	VarHolder* _pHolder;
 };
 
diff --git a/Foundation/src/Var.cpp b/Foundation/src/Var.cpp
index bc40b44e3..84e19076d 100644
--- a/Foundation/src/Var.cpp
+++ b/Foundation/src/Var.cpp
@@ -477,4 +477,10 @@ std::string Var::toString(const Var& any)
 }
 
 
+Var& Var::structIndexOperator(VarHolderImpl<Struct<int> >* pStr, int n) const
+{
+	return pStr->operator[](n);
+}
+
+
 } } // namespace Poco::Dynamic