diff --git a/ubi/item_updater_ubi.cpp b/ubi/item_updater_ubi.cpp
index 1c2926a..354610b 100644
--- a/ubi/item_updater_ubi.cpp
+++ b/ubi/item_updater_ubi.cpp
@@ -487,7 +487,7 @@
     }
 }
 
-std::string ItemUpdater::determineId(const std::string& symlinkPath)
+std::string ItemUpdaterUbi::determineId(const std::string& symlinkPath)
 {
     if (!fs::exists(symlinkPath))
     {
diff --git a/ubi/item_updater_ubi.hpp b/ubi/item_updater_ubi.hpp
index af330a8..dfc8e53 100644
--- a/ubi/item_updater_ubi.hpp
+++ b/ubi/item_updater_ubi.hpp
@@ -41,6 +41,14 @@
 
     bool isVersionFunctional(const std::string& versionId) override;
 
+    /** @brief Determine the software version id
+     *         from the symlink target (e.g. /media/ro-2a1022fe).
+     *
+     * @param[in] symlinkPath - The path of the symlink.
+     * @param[out] id - The version id as a string.
+     */
+    static std::string determineId(const std::string& symlinkPath);
+
   private:
     /** @brief Callback function for Software.Version match.
      *  @details Creates an Activation D-Bus object.
diff --git a/ubi/watch.cpp b/ubi/watch.cpp
index 192d3d9..60d0014 100644
--- a/ubi/watch.cpp
+++ b/ubi/watch.cpp
@@ -2,7 +2,7 @@
 
 #include "watch.hpp"
 
-#include "item_updater.hpp"
+#include "item_updater_ubi.hpp"
 
 #include <sys/inotify.h>
 #include <unistd.h>
@@ -93,7 +93,7 @@
         path /= event->name;
         if (fs::equivalent(path, PNOR_RO_ACTIVE_PATH))
         {
-            auto id = ItemUpdater::determineId(path);
+            auto id = ItemUpdaterUbi::determineId(path);
             static_cast<Watch*>(userdata)->functionalCallback(id);
         }
         offset += offsetof(inotify_event, name) + event->len;