diff --git a/src/columns/ColTypeDuration.cpp b/src/columns/ColTypeDuration.cpp
index 1fdeba27f..8d7076270 100644
--- a/src/columns/ColTypeDuration.cpp
+++ b/src/columns/ColTypeDuration.cpp
@@ -30,6 +30,7 @@
 ////////////////////////////////////////////////////////////////////////////////
 ColumnTypeDuration::ColumnTypeDuration ()
 {
+  _type = "duration";
 }
 
 ////////////////////////////////////////////////////////////////////////////////