diff --git a/src/rntuple.cpp b/src/rntuple.cpp
index adc3f45..2197340 100644
--- a/src/rntuple.cpp
+++ b/src/rntuple.cpp
@@ -109,9 +109,7 @@ void gather_metadata(Arena *arena, RMicroFileReader &reader, const RNTuple_File_
     }
     ++n_clusters;
 
-    // for (const RClusterDescriptor::RColumnRange &col_range : cluster_desc.GetColumnRangeIterable()) {
-    for (auto col_id : cluster_desc.GetColumnIds()) {
-      const auto &col_range = cluster_desc.GetColumnRange(col_id);
+    for (const RClusterDescriptor::RColumnRange &col_range : cluster_desc.GetColumnRangeIterable()) {
       // insert page infos sorted by byte range
       // @Speed: this is slow! speed it up!
       const auto &page_range = cluster_desc.GetPageRange(col_range.fPhysicalColumnId);