diff --git a/owlps-positioner/src/autocalibration.cc b/owlps-positioner/src/autocalibration.cc
index 2bd964c..992c1c3 100644
--- a/owlps-positioner/src/autocalibration.cc
+++ b/owlps-positioner/src/autocalibration.cc
@@ -7,6 +7,8 @@
 
 #include <map>
 #include <string>
+#include <iostream>
+#include <sstream>
 
 using namespace std ;
 using std::tr1::unordered_map ;