diff --git a/locked_queue.hh b/locked_queue.hh
index 970b1f1..62bbd10 100644
--- a/locked_queue.hh
+++ b/locked_queue.hh
@@ -1,7 +1,7 @@
-// this file is under GNU GPL 3.0, see LICENSE.txt
+// This file is under GNU General Public License 3.0
+// see LICENSE.txt
 
-#ifndef PEP_LOCKED_QUEUE
-#define PEP_LOCKED_QUEUE
+#pragma once
 
 #include <list>
 #include <condition_variable>
@@ -161,4 +161,3 @@ namespace utility
     };
 }
 
-#endif // PEP_LOCKED_QUEUE
diff --git a/pc_container.hh b/pc_container.hh
index 2743d90..e6a6af4 100644
--- a/pc_container.hh
+++ b/pc_container.hh
@@ -1,5 +1,7 @@
-#ifndef PEP_LIB_PC_CONTAINER
-#define PEP_LIB_PC_CONTAINER
+// This file is under GNU General Public License 3.0
+// see LICENSE.txt
+
+#pragma once
 
 // Conainer adapter that contains a container and a producer/consume queue
 // that holds references to all changed elements
@@ -80,4 +82,3 @@ private:
 
 } // end of namespace pEp
 
-#endif // PEP_LIB_PC_CONTAINER