diff --git a/src/sdeventplus/utility/timer.cpp b/src/sdeventplus/utility/timer.cpp
index 6ad684c..7c75e07 100644
--- a/src/sdeventplus/utility/timer.cpp
+++ b/src/sdeventplus/utility/timer.cpp
@@ -102,7 +102,7 @@
     expired = true;
     if (callback)
     {
-        callback();
+        callback(*this);
     }
     resetRemaining();
 }
diff --git a/src/sdeventplus/utility/timer.hpp b/src/sdeventplus/utility/timer.hpp
index a9d4fbc..8865ba1 100644
--- a/src/sdeventplus/utility/timer.hpp
+++ b/src/sdeventplus/utility/timer.hpp
@@ -31,7 +31,7 @@
     /** @brief Type of the user provided callback function when the
      *         timer elapses.
      */
-    using Callback = std::function<void()>;
+    using Callback = std::function<void(Timer<Id>&)>;
 
     Timer(const Timer& other) = delete;
     Timer(Timer&& other) = default;
diff --git a/test/utility/timer.cpp b/test/utility/timer.cpp
index c919f7e..414ad82 100644
--- a/test/utility/timer.cpp
+++ b/test/utility/timer.cpp
@@ -91,7 +91,7 @@
             .WillRepeatedly(DoAll(EventUnref(), Return(nullptr)));
         Event event(expected_event, &mock);
 
-        auto runCallback = [&]() {
+        auto runCallback = [&](TestTimer&) {
             if (callback)
             {
                 callback();