diff --git a/src/Hdf5MasterFile.cpp b/src/Hdf5MasterFile.cpp
index f97a1c7..5cf6692 100644
--- a/src/Hdf5MasterFile.cpp
+++ b/src/Hdf5MasterFile.cpp
@@ -1,5 +1,6 @@
 #include "aare/Hdf5MasterFile.hpp"
 #include <sstream>
+#include <iomanip>
 namespace aare {
 
 Hdf5FileNameComponents::Hdf5FileNameComponents(