diff --git a/src/configuration.hh b/src/configuration.hh
index 2e8ca5dc2574192a88095c342bee10c3e049e0fd..0b23bda122d9bc801a3bdbd4f67224879b30bf63 100644
--- a/src/configuration.hh
+++ b/src/configuration.hh
@@ -15,4 +15,11 @@ struct Configuration
 
 };
 
+//! Send configuration to output stream
+std::ostream& operator<< (std::ostream& s, const Configuration& c)
+  {
+      s << "(" << c.r << ")  (" << c.q << ")";
+      return s;
+  }
+
 #endif