diff --git a/NETMapnik/mapnik_layer.cpp b/NETMapnik/mapnik_layer.cpp
index 3316cc4..fc44a69 100644
--- a/NETMapnik/mapnik_layer.cpp
+++ b/NETMapnik/mapnik_layer.cpp
@@ -64,11 +64,11 @@ namespace NETMapnik
 		(*_layer)->set_srs(msclr::interop::marshal_as<std::string>(value));
 	}
 
-	bool Layer::CacheFeatures::get()
+	System::Boolean Layer::CacheFeatures::get()
 	{
 		return (*_layer)->cache_features();
 	}
-	void Layer::CacheFeatures::set(bool value)
+	void Layer::CacheFeatures::set(System::Boolean value)
 	{
 		(*_layer)->set_cache_features(value);
 	}
diff --git a/NETMapnik/mapnik_layer.h b/NETMapnik/mapnik_layer.h
index a09dd4f..43d034a 100644
--- a/NETMapnik/mapnik_layer.h
+++ b/NETMapnik/mapnik_layer.h
@@ -31,10 +31,10 @@ namespace NETMapnik
 			void set(System::String^ value);
 		}
 
-		property bool CacheFeatures
+		property System::Boolean CacheFeatures
 		{
-			bool get();
-			void set(bool value);
+			System::Boolean get();
+			void set(System::Boolean value);
 		}
 
 		property System::Collections::Generic::IEnumerable<System::String^>^ Styles