diff --git a/sf-writer/sf_h5_writer.cpp b/sf-writer/sf_h5_writer.cpp
index 9b9a15a..d3f4bb1 100644
--- a/sf-writer/sf_h5_writer.cpp
+++ b/sf-writer/sf_h5_writer.cpp
@@ -8,6 +8,8 @@
 #include "config.hpp"
 #include "SfFormat.cpp"
 
+using namespace std;
+
 int main (int argc, char *argv[])
 {
     if (argc != 7) {