diff --git a/test/test_flat_set.cpp b/test/test_flat_set.cpp
index 9bcbc73a..b7530a6d 100644
--- a/test/test_flat_set.cpp
+++ b/test/test_flat_set.cpp
@@ -101,7 +101,7 @@ namespace
     std::vector<NDC> initial_data;
     std::vector<NDC> excess_data;
     std::vector<NDC> different_data;
-
+    
     std::vector<int> int_data;
 
     struct D1