diff --git a/src/core/model/nstime.h b/src/core/model/nstime.h
index 2abe0b67a..5e83b66f7 100644
--- a/src/core/model/nstime.h
+++ b/src/core/model/nstime.h
@@ -545,6 +545,13 @@ public:
    */
   TimeWithUnit As (const enum Unit unit) const;
 
+  /**
+   * TracedCallback signature for Time
+   *
+   * \param [in] value Current value of Time
+   */
+  typedef void (* TracedCallback)(Time value);
+
 private:
   /** How to convert between other units and the current unit. */
   struct Information