diff --git a/src/DownloadCommand.cc b/src/DownloadCommand.cc
index de4c9221c..9d1c9b964 100644
--- a/src/DownloadCommand.cc
+++ b/src/DownloadCommand.cc
@@ -419,4 +419,8 @@ void DownloadCommand::installStreamFilter(
   sinkFilterOnly_ = util::endsWith(name, SinkStreamFilter::NAME);
 }
 
+// We need to override noCheck() to return true in order to measure
+// download speed to check lowest speed.
+bool DownloadCommand::noCheck() const { return true; }
+
 } // namespace aria2
diff --git a/src/DownloadCommand.h b/src/DownloadCommand.h
index d039c9f29..aeee4416a 100644
--- a/src/DownloadCommand.h
+++ b/src/DownloadCommand.h
@@ -72,6 +72,8 @@ private:
 protected:
   virtual bool executeInternal() CXX11_OVERRIDE;
 
+  virtual bool noCheck() const CXX11_OVERRIDE;
+
   virtual bool prepareForNextSegment();
 
   // This is file local offset