diff --git a/src/columns/ColTypeDuration.cpp b/src/columns/ColTypeDuration.cpp
index 79ed79016..049b0327e 100644
--- a/src/columns/ColTypeDuration.cpp
+++ b/src/columns/ColTypeDuration.cpp
@@ -49,3 +49,9 @@ void ColumnTypeDuration::render (
 }
 
 ////////////////////////////////////////////////////////////////////////////////
+void ColumnTypeDuration::modify (Task& task, const std::string& value)
+{
+  task.set (_name, value);
+}
+
+////////////////////////////////////////////////////////////////////////////////
diff --git a/src/columns/ColTypeDuration.h b/src/columns/ColTypeDuration.h
index 4fdcf0f41..e864eff97 100644
--- a/src/columns/ColTypeDuration.h
+++ b/src/columns/ColTypeDuration.h
@@ -39,6 +39,7 @@ public:
   ColumnTypeDuration ();
   virtual void measure (Task&, unsigned int&, unsigned int&);
   virtual void render (std::vector <std::string>&, Task&, int, Color&);
+  virtual void modify (Task&, const std::string&);
 };
 
 #endif