diff --git a/Tutorials/OpenData/flowAnalysis.cxx b/Tutorials/OpenData/flowAnalysis.cxx
index 677a1d8d5f0..dc5e180b300 100644
--- a/Tutorials/OpenData/flowAnalysis.cxx
+++ b/Tutorials/OpenData/flowAnalysis.cxx
@@ -289,7 +289,7 @@ struct flow_base {
     return grpo->getNominalL3Field();
   }
 
-  void process(FilteredCollisions::iterator const& collision, BCsWithRun2Infos const&  /*bcs*/, FilteredTracks const& tracks)
+  void process(FilteredCollisions::iterator const& collision, BCsWithRun2Infos const& /*bcs*/, FilteredTracks const& tracks)
   {
     // Some utilities
     //_______________________________________________________________________________