diff --git a/src/setup.cc b/src/setup.cc
index a7945f3f84491f43b237584bbe891c5421c0a2d3..b0c964fac6f1cf4c2b2b6004bc61c16b31871a13 100644
--- a/src/setup.cc
+++ b/src/setup.cc
@@ -206,7 +206,7 @@ namespace MUSIC {
         if (!config.is_open ())
           {
             std::ostringstream oss;
-            oss << "MUSIC: Couldn't open configuration file: " << filename;
+            oss << "MUSIC: Couldn't open configuration file: " << filename << '\n';
             error0 (oss.str ());
           }