diff --git a/cpp/projectiveGeometry.h b/cpp/projectiveGeometry.h
index 7af1aaa48..076817919 100644
--- a/cpp/projectiveGeometry.h
+++ b/cpp/projectiveGeometry.h
@@ -5,6 +5,8 @@
  * @author: Frank Dellaert
  */
 
+#pragma once
+
 #include <list>
 #include "tensors.h"
 
diff --git a/cpp/tensorInterface.h b/cpp/tensorInterface.h
index c3d2b7018..c96adf1bf 100644
--- a/cpp/tensorInterface.h
+++ b/cpp/tensorInterface.h
@@ -5,6 +5,8 @@
  * @author: Frank Dellaert
  */
 
+#pragma once
+
 #include "tensors.h"
 #include "Matrix.h"