diff --git a/src/metier_server/App.hpp b/src/metier_server/App.hpp
index 150d11a..a6b3d38 100644
--- a/src/metier_server/App.hpp
+++ b/src/metier_server/App.hpp
@@ -3,6 +3,8 @@
 // License, v. 2.0. If a copy of the MPL was not distributed with this
 // file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
+#pragma once
+
 #include <opentxs/opentxs.hpp>
 
 #include "metier_server/Options.hpp"
diff --git a/src/metier_server/EventLoop.hpp b/src/metier_server/EventLoop.hpp
index 4f29818..95787be 100644
--- a/src/metier_server/EventLoop.hpp
+++ b/src/metier_server/EventLoop.hpp
@@ -3,6 +3,8 @@
 // License, v. 2.0. If a copy of the MPL was not distributed with this
 // file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
+#pragma once
+
 #include <opentxs/opentxs.hpp>
 
 namespace metier_server
diff --git a/src/metier_server/Options.hpp b/src/metier_server/Options.hpp
index b8c38c5..0bd6804 100644
--- a/src/metier_server/Options.hpp
+++ b/src/metier_server/Options.hpp
@@ -3,6 +3,8 @@
 // License, v. 2.0. If a copy of the MPL was not distributed with this
 // file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
+#pragma once
+
 #pragma GCC diagnostic push
 #pragma GCC diagnostic ignored "-Wnull-dereference"
 #include <boost/program_options.hpp>