diff --git a/test/test.cpp b/test/test.cpp
index eb3629e9f..e5cddaa0e 100644
--- a/test/test.cpp
+++ b/test/test.cpp
@@ -393,7 +393,7 @@ void UnitTest::diag (const std::string& text)
 {
   std::string::size_type start = text.find_first_not_of (" \t\n\r\f");
   std::string::size_type end   = text.find_last_not_of  (" \t\n\r\f");
-  std::cout << "# " << text.substr (start, end - start + 1);
+  std::cout << "# " << text.substr (start, end - start + 1) << "\n";
 }
 
 ///////////////////////////////////////////////////////////////////////////////