diff --git a/src/rntuple.cpp b/src/rntuple.cpp
index 36f7f93..7796ec0 100644
--- a/src/rntuple.cpp
+++ b/src/rntuple.cpp
@@ -150,7 +150,7 @@ void gather_ntuple_metadata(Arena *arena, RMicroFileReader &reader, const RNTupl
   chr::time_point end_t = chr::high_resolution_clock::now();
   u64 time_spent_ms = chr::duration_cast<chr::milliseconds>(end_t - start_t).count();
 
-  fprintf(stderr, "Loaded %lu pages in %lu ms (%lu took the slow path).\nGenerating groups...\n", n_pages, n_slow, time_spent_ms);
+  fprintf(stderr, "Loaded %lu pages in %lu ms (%lu took the slow path).\nGenerating groups...\n", n_pages, time_spent_ms, n_slow);
 
   // Create page groups and chunks.
   // Each page group is a grouping of GROUP_SIZE page infos whose range is equal to the combined ranges