diff --git a/include/sdbus-c++/IConnection.h b/include/sdbus-c++/IConnection.h
index 0fdb717..462d771 100644
--- a/include/sdbus-c++/IConnection.h
+++ b/include/sdbus-c++/IConnection.h
@@ -79,7 +79,7 @@ namespace sdbus {
          *
          * @throws sdbus::Error in case of failure
          */
-        virtual std::string getUniqueName() = 0;
+        virtual std::string getUniqueName() const = 0;
 
         /*!
          * @brief Enters the D-Bus processing loop
@@ -137,7 +137,7 @@ namespace sdbus {
          *
          * @throws sdbus::Error in case of failure
          */
-        virtual PollData getProcessLoopPollData() = 0;
+        virtual PollData getProcessLoopPollData() const = 0;
 
         /*!
          * @brief Process a pending request
diff --git a/src/Connection.cpp b/src/Connection.cpp
index 025245b..db385f3 100644
--- a/src/Connection.cpp
+++ b/src/Connection.cpp
@@ -76,7 +76,7 @@ void Connection::releaseName(const std::string& name)
     SDBUS_THROW_ERROR_IF(r < 0, "Failed to release bus name", -r);
 }
 
-std::string Connection::getUniqueName()
+std::string Connection::getUniqueName() const
 {
     const char* unique = nullptr;
     auto r = iface_->sd_bus_get_unique_name(bus_.get(), &unique);
@@ -110,7 +110,7 @@ void Connection::leaveProcessingLoop()
     joinWithProcessingLoop();
 }
 
-sdbus::IConnection::PollData Connection::getProcessLoopPollData()
+sdbus::IConnection::PollData Connection::getProcessLoopPollData() const
 {
     ISdBus::PollData pollData;
     auto r = iface_->sd_bus_get_poll_data(bus_.get(), &pollData);
diff --git a/src/Connection.h b/src/Connection.h
index 1b9bf24..d5c6b57 100644
--- a/src/Connection.h
+++ b/src/Connection.h
@@ -57,11 +57,11 @@ namespace sdbus { namespace internal {
 
         void requestName(const std::string& name) override;
         void releaseName(const std::string& name) override;
-        std::string getUniqueName() override;
+        std::string getUniqueName() const override;
         void enterProcessingLoop() override;
         void enterProcessingLoopAsync() override;
         void leaveProcessingLoop() override;
-        sdbus::IConnection::PollData getProcessLoopPollData() override;
+        sdbus::IConnection::PollData getProcessLoopPollData() const override;
         bool processPendingRequest() override;
 
         void addObjectManager(const std::string& objectPath) override;
diff --git a/tests/unittests/mocks/SdBusMock.h b/tests/unittests/mocks/SdBusMock.h
index df8e48c..468e0be 100644
--- a/tests/unittests/mocks/SdBusMock.h
+++ b/tests/unittests/mocks/SdBusMock.h
@@ -61,6 +61,7 @@ public:
     MOCK_METHOD2(sd_bus_open_system_remote, int(sd_bus **ret, const char *host));
     MOCK_METHOD3(sd_bus_request_name, int(sd_bus *bus, const char *name, uint64_t flags));
     MOCK_METHOD2(sd_bus_release_name, int(sd_bus *bus, const char *name));
+    MOCK_METHOD2(sd_bus_get_unique_name, int(sd_bus *bus, const char **name));
     MOCK_METHOD6(sd_bus_add_object_vtable, int(sd_bus *bus, sd_bus_slot **slot, const char *path, const char *interface, const sd_bus_vtable *vtable, void *userdata));
     MOCK_METHOD3(sd_bus_add_object_manager, int(sd_bus *bus, sd_bus_slot **slot, const char *path));
     MOCK_METHOD5(sd_bus_add_match, int(sd_bus *bus, sd_bus_slot **slot, const char *match, sd_bus_message_handler_t callback, void *userdata));