diff --git a/cpp/Testable.h b/cpp/Testable.h
index 63ba92139..d7da3d9c8 100644
--- a/cpp/Testable.h
+++ b/cpp/Testable.h
@@ -9,6 +9,7 @@
 #pragma once
 
 #include <boost/shared_ptr.hpp>
+#include <stdio.h>
 
 namespace gtsam {
 
diff --git a/cpp/Vector.cpp b/cpp/Vector.cpp
index 39396e1fc..e28a3c940 100644
--- a/cpp/Vector.cpp
+++ b/cpp/Vector.cpp
@@ -11,6 +11,7 @@
 #include <iomanip>
 #include <cmath>
 #include <boost/foreach.hpp>
+#include <stdio.h>
 
 #ifdef WIN32
 #include <Windows.h>