diff --git a/openVulkanoCpp/Base/Observable.hpp b/openVulkanoCpp/Base/Observable.hpp
index d364afc..7688066 100644
--- a/openVulkanoCpp/Base/Observable.hpp
+++ b/openVulkanoCpp/Base/Observable.hpp
@@ -4,6 +4,8 @@
  * file, You can obtain one at https://mozilla.org/MPL/2.0/.
  */
 
+#pragma once
+
 #include "Event.hpp"
 
 namespace OpenVulkano