diff --git a/gtsam_unstable/base/BTree.h b/gtsam_unstable/base/BTree.h
index 9d854a169..94e27d6c4 100644
--- a/gtsam_unstable/base/BTree.h
+++ b/gtsam_unstable/base/BTree.h
@@ -17,6 +17,8 @@
  * @date Feb 3, 2010
  */
 
+#pragma once
+
 #include <stack>
 #include <sstream>
 #include <boost/shared_ptr.hpp>
diff --git a/gtsam_unstable/base/Dummy.h b/gtsam_unstable/base/Dummy.h
index a2f544de5..548bce344 100644
--- a/gtsam_unstable/base/Dummy.h
+++ b/gtsam_unstable/base/Dummy.h
@@ -17,6 +17,8 @@
  * @date June 14, 2012
  */
 
+#pragma once
+
 #include <gtsam/global_includes.h>
 #include <gtsam_unstable/dllexport.h>
 #include <string>
diff --git a/gtsam_unstable/linear/ActiveSetSolver-inl.h b/gtsam_unstable/linear/ActiveSetSolver-inl.h
index 12374ac76..a0f7e5337 100644
--- a/gtsam_unstable/linear/ActiveSetSolver-inl.h
+++ b/gtsam_unstable/linear/ActiveSetSolver-inl.h
@@ -17,6 +17,8 @@
  * @date     2/11/16
  */
 
+#pragma once
+
 #include <gtsam_unstable/linear/InfeasibleInitialValues.h>
 
 /******************************************************************************/
diff --git a/gtsam_unstable/linear/LPSolver.h b/gtsam_unstable/linear/LPSolver.h
index 460b4b7ee..f36462bda 100644
--- a/gtsam_unstable/linear/LPSolver.h
+++ b/gtsam_unstable/linear/LPSolver.h
@@ -17,6 +17,8 @@
  * @date     6/16/16
  */
 
+#pragma once
+
 #include <gtsam_unstable/linear/LP.h>
 #include <gtsam_unstable/linear/ActiveSetSolver.h>
 #include <gtsam_unstable/linear/LPInitSolver.h>
diff --git a/gtsam_unstable/linear/QPSolver.h b/gtsam_unstable/linear/QPSolver.h
index 3854d2a15..86cf51f1c 100644
--- a/gtsam_unstable/linear/QPSolver.h
+++ b/gtsam_unstable/linear/QPSolver.h
@@ -17,6 +17,8 @@
  * @date     6/16/16
  */
 
+#pragma once
+
 #include <gtsam_unstable/linear/QP.h>
 #include <gtsam_unstable/linear/ActiveSetSolver.h>
 #include <gtsam_unstable/linear/QPInitSolver.h>
diff --git a/gtsam_unstable/partition/FindSeparator.h b/gtsam_unstable/partition/FindSeparator.h
index 42d971a82..f4342695b 100644
--- a/gtsam_unstable/partition/FindSeparator.h
+++ b/gtsam_unstable/partition/FindSeparator.h
@@ -6,6 +6,8 @@
  *  Description: find the separator of bisectioning for a given graph
  */
 
+#pragma once
+
 #include <map>
 #include <vector>
 #include <boost/optional.hpp>