diff --git a/src/sdeventplus/source/child.cpp b/src/sdeventplus/source/child.cpp
index cda067b..b549473 100644
--- a/src/sdeventplus/source/child.cpp
+++ b/src/sdeventplus/source/child.cpp
@@ -14,6 +14,11 @@
 {
 }
 
+void Child::set_callback(Callback&& callback)
+{
+    this->callback = std::move(callback);
+}
+
 pid_t Child::get_pid() const
 {
     pid_t pid;
diff --git a/src/sdeventplus/source/child.hpp b/src/sdeventplus/source/child.hpp
index 3a9857f..ed147d6 100644
--- a/src/sdeventplus/source/child.hpp
+++ b/src/sdeventplus/source/child.hpp
@@ -31,6 +31,12 @@
      */
     Child(const Event& event, pid_t pid, int options, Callback&& callback);
 
+    /** @brief Sets the callback
+     *
+     *  @param[in] callback - The function executed on event dispatch
+     */
+    void set_callback(Callback&& callback);
+
     /** @brief Gets the pid of the child process being watched
      *
      *  @return The child pid
diff --git a/src/sdeventplus/source/event.cpp b/src/sdeventplus/source/event.cpp
index 12d4d2b..c73f16c 100644
--- a/src/sdeventplus/source/event.cpp
+++ b/src/sdeventplus/source/event.cpp
@@ -7,6 +7,11 @@
 namespace source
 {
 
+void EventBase::set_callback(Callback&& callback)
+{
+    this->callback = std::move(callback);
+}
+
 EventBase::EventBase(const char* name, CreateFunc create, const Event& event,
                      Callback&& callback) :
     Base(event, create_source(name, create, event), std::false_type()),
diff --git a/src/sdeventplus/source/event.hpp b/src/sdeventplus/source/event.hpp
index cc23209..c384364 100644
--- a/src/sdeventplus/source/event.hpp
+++ b/src/sdeventplus/source/event.hpp
@@ -21,6 +21,12 @@
   public:
     using Callback = std::function<void(EventBase& source)>;
 
+    /** @brief Sets the callback
+     *
+     *  @param[in] callback - The function executed on event dispatch
+     */
+    void set_callback(Callback&& callback);
+
   protected:
     using CreateFunc = decltype(&internal::SdEvent::sd_event_add_exit);
 
diff --git a/src/sdeventplus/source/io.cpp b/src/sdeventplus/source/io.cpp
index a325f91..49583d0 100644
--- a/src/sdeventplus/source/io.cpp
+++ b/src/sdeventplus/source/io.cpp
@@ -13,6 +13,11 @@
 {
 }
 
+void IO::set_callback(Callback&& callback)
+{
+    this->callback = std::move(callback);
+}
+
 int IO::get_fd() const
 {
     int r = event.getSdEvent()->sd_event_source_get_io_fd(source.get());
diff --git a/src/sdeventplus/source/io.hpp b/src/sdeventplus/source/io.hpp
index 61e9681..b35500e 100644
--- a/src/sdeventplus/source/io.hpp
+++ b/src/sdeventplus/source/io.hpp
@@ -32,6 +32,12 @@
      */
     IO(const Event& event, int fd, uint32_t events, Callback&& callback);
 
+    /** @brief Sets the callback
+     *
+     *  @param[in] callback - The function executed on event dispatch
+     */
+    void set_callback(Callback&& callback);
+
     /** @brief Gets the file descriptor tied to the source
      *
      *  @throws SdEventError for underlying sd_event errors
diff --git a/src/sdeventplus/source/signal.cpp b/src/sdeventplus/source/signal.cpp
index 1df3a29..98b1a05 100644
--- a/src/sdeventplus/source/signal.cpp
+++ b/src/sdeventplus/source/signal.cpp
@@ -14,6 +14,11 @@
 {
 }
 
+void Signal::set_callback(Callback&& callback)
+{
+    this->callback = std::move(callback);
+}
+
 int Signal::get_signal() const
 {
     int r = event.getSdEvent()->sd_event_source_get_signal(source.get());
diff --git a/src/sdeventplus/source/signal.hpp b/src/sdeventplus/source/signal.hpp
index d5d9b5a..f62db44 100644
--- a/src/sdeventplus/source/signal.hpp
+++ b/src/sdeventplus/source/signal.hpp
@@ -33,6 +33,12 @@
      */
     Signal(const Event& event, int sig, Callback&& callback);
 
+    /** @brief Sets the callback
+     *
+     *  @param[in] callback - The function executed on event dispatch
+     */
+    void set_callback(Callback&& callback);
+
     /** @brief Gets the signum watched by the source
      *
      *  @throws SdEventError for underlying sd_event errors
diff --git a/src/sdeventplus/source/time.cpp b/src/sdeventplus/source/time.cpp
index 1a24604..bbc3295 100644
--- a/src/sdeventplus/source/time.cpp
+++ b/src/sdeventplus/source/time.cpp
@@ -20,6 +20,12 @@
 }
 
 template <ClockId Id>
+void Time<Id>::set_callback(Callback&& callback)
+{
+    this->callback = std::move(callback);
+}
+
+template <ClockId Id>
 typename Time<Id>::TimePoint Time<Id>::get_time() const
 {
     uint64_t usec;
diff --git a/src/sdeventplus/source/time.hpp b/src/sdeventplus/source/time.hpp
index c43de7a..ef79803 100644
--- a/src/sdeventplus/source/time.hpp
+++ b/src/sdeventplus/source/time.hpp
@@ -40,6 +40,12 @@
     Time(const Event& event, TimePoint time, Accuracy accuracy,
          Callback&& callback);
 
+    /** @brief Sets the callback
+     *
+     *  @param[in] callback - The function executed on event dispatch
+     */
+    void set_callback(Callback&& callback);
+
     /** @brief Gets the absolute time when the time source expires
      *
      *  @throws SdEventError for underlying sd_event errors
diff --git a/test/source/child.cpp b/test/source/child.cpp
index e1e1322..ab173b1 100644
--- a/test/source/child.cpp
+++ b/test/source/child.cpp
@@ -91,6 +91,10 @@
     EXPECT_EQ(1, completions);
     EXPECT_EQ(expected_si, return_si);
 
+    child.set_callback(std::bind([]() {}));
+    EXPECT_EQ(0, handler(nullptr, expected_si, &child));
+    EXPECT_EQ(1, completions);
+
     expect_destruct();
 }
 
diff --git a/test/source/event.cpp b/test/source/event.cpp
index 90edaec..e4d7b2a 100644
--- a/test/source/event.cpp
+++ b/test/source/event.cpp
@@ -83,6 +83,10 @@
     EXPECT_EQ(0, handler(nullptr, &defer));
     EXPECT_EQ(1, completions);
 
+    defer.set_callback(std::bind([]() {}));
+    EXPECT_EQ(0, handler(nullptr, &defer));
+    EXPECT_EQ(1, completions);
+
     expect_destruct();
 }
 
diff --git a/test/source/io.cpp b/test/source/io.cpp
index b680be7..89506b1 100644
--- a/test/source/io.cpp
+++ b/test/source/io.cpp
@@ -92,6 +92,10 @@
     EXPECT_EQ(5, return_fd);
     EXPECT_EQ(EPOLLIN, return_revents);
 
+    io.set_callback(std::bind([]() {}));
+    EXPECT_EQ(0, handler(nullptr, 5, EPOLLIN, &io));
+    EXPECT_EQ(1, completions);
+
     expect_destruct();
 }
 
diff --git a/test/source/signal.cpp b/test/source/signal.cpp
index c99aa6b..d3b53a7 100644
--- a/test/source/signal.cpp
+++ b/test/source/signal.cpp
@@ -92,6 +92,10 @@
     EXPECT_EQ(1, completions);
     EXPECT_EQ(expected_si, return_si);
 
+    signal.set_callback(std::bind([]() {}));
+    EXPECT_EQ(0, handler(nullptr, expected_si, &signal));
+    EXPECT_EQ(1, completions);
+
     expect_destruct();
 }
 
diff --git a/test/source/time.cpp b/test/source/time.cpp
index aa25da0..96a920e 100644
--- a/test/source/time.cpp
+++ b/test/source/time.cpp
@@ -90,6 +90,11 @@
     EXPECT_EQ(Time<id>::TimePoint(std::chrono::microseconds(2000100)),
               saved_time);
 
+    time.set_callback(std::bind([]() {}));
+    EXPECT_EQ(0, handler(nullptr, 0, userdata));
+    EXPECT_EQ(Time<id>::TimePoint(std::chrono::microseconds(2000100)),
+              saved_time);
+
     expect_time_destroy(expected_event, expected_source);
 }