diff --git a/tree/dataframe/src/RNTupleProcessorDS.cxx b/tree/dataframe/src/RNTupleProcessorDS.cxx
index 9ae3d75ae5962..4cb22feee8b87 100644
--- a/tree/dataframe/src/RNTupleProcessorDS.cxx
+++ b/tree/dataframe/src/RNTupleProcessorDS.cxx
@@ -36,7 +36,7 @@ class RNTupleProcessorColumnReader : public ROOT::Detail::RDF::RColumnReaderBase
    RNTupleProcessorColumnReader(RNTupleProcessorOptionalPtr<void> &valuePtr) : fValuePtr(std::move(valuePtr)) {}
    ~RNTupleProcessorColumnReader() override = default;
 
-   void *GetImpl(Long64_t entry) final
+   void *GetImpl(Long64_t entry [[maybe_unused]]) final
    {
       assert(entry == fLastLoadedEntry);
       return fValuePtr.GetPtr().get();