diff --git a/src/one-body-sample.cc b/src/one-body-sample.cc
index 830eb1092d0e7dc23b1423f55a590b98a6b0d509..427ec512cc7b35304d740b0599139298b737ab6f 100644
--- a/src/one-body-sample.cc
+++ b/src/one-body-sample.cc
@@ -302,7 +302,8 @@ int main(int argc, char *argv[]) {
             break;
 
           if (state_fpi == state_fpi_max)
-            std::cerr << "FPI did not converge after " << state_fpi_max
+            std::cerr << "[ref = " << refinements
+                      << "]: FPI did not converge after " << state_fpi_max
                       << " iterations" << std::endl;
         }
         if (parset.get<bool>("printProgress"))