diff --git a/include/IROptimizerObserver.h b/include/IROptimizerObserver.h
index 0498d6b..ef1f99c 100644
--- a/include/IROptimizerObserver.h
+++ b/include/IROptimizerObserver.h
@@ -59,7 +59,7 @@ class optimizer_observer_t : public itk::Command
     const TOptimizer * optimizer = dynamic_cast<const TOptimizer *>(object);
     *log_ << (unsigned int)(optimizer->GetCurrentIteration()) << '\t'
 	  << optimizer->GetValue() << '\t'
-	  << optimizer->GetCurrentPosition() << endl;
+	  << optimizer->GetCurrentPosition() << std::endl;
   }
   
   the_log_t * log_;
diff --git a/include/IRStdThreadStorage.h b/include/IRStdThreadStorage.h
index 1f0aa5f..b05776d 100644
--- a/include/IRStdThreadStorage.h
+++ b/include/IRStdThreadStorage.h
@@ -31,6 +31,7 @@
 
 // local includes:
 #include "IRThreadStorage.h"
+#include "IRThreadInterface.h"
 
 // std includes:
 #include <thread>