diff --git a/src/Processors/ISource.h b/src/Processors/ISource.h
index 8c140d0d0a3..778042c5b56 100644
--- a/src/Processors/ISource.h
+++ b/src/Processors/ISource.h
@@ -44,7 +44,7 @@ public:
     void setStorageLimits(const std::shared_ptr<const StorageLimitsList> & storage_limits_) override;
 
     /// Default implementation for all the sources.
-    std::optional<ReadProgress> getReadProgress() final;
+    std::optional<ReadProgress> getReadProgress() override;
 
     void addTotalRowsApprox(size_t value);
     void addTotalBytes(size_t value);
diff --git a/src/Processors/Transforms/AggregatingTransform.cpp b/src/Processors/Transforms/AggregatingTransform.cpp
index 74da97f2199..ea5c525d5f2 100644
--- a/src/Processors/Transforms/AggregatingTransform.cpp
+++ b/src/Processors/Transforms/AggregatingTransform.cpp
@@ -80,6 +80,8 @@ namespace
             return convertToChunk(block);
         }
 
+        std::optional<ReadProgress> getReadProgress() override { return std::nullopt; }
+
     private:
         TemporaryFileStream * tmp_stream;
     };