diff --git a/src/feedback.cpp b/src/feedback.cpp
index 7bbb7966e..e7419c68b 100644
--- a/src/feedback.cpp
+++ b/src/feedback.cpp
@@ -33,7 +33,7 @@
 #include <stdlib.h>
 #include <inttypes.h>
 #include <Context.h>
-#include <Duration.h>
+#include <ISO8601.h>
 #include <main.h>
 #include <text.h>
 #include <util.h>
@@ -205,7 +205,7 @@ std::string taskInfoDifferences (
     else if (name == "start")
     {
       out << format (STRING_FEEDBACK_ATT_DEL_DUR, ucFirst (name),
-                     Duration (current_timestamp - last_timestamp).formatPrecise ())
+                     ISO8601p (current_timestamp - last_timestamp).format ())
           << "\n";
     }
     else