diff --git a/ubi/item_updater_ubi.hpp b/ubi/item_updater_ubi.hpp
index 5de51d3..ce1b5b8 100644
--- a/ubi/item_updater_ubi.hpp
+++ b/ubi/item_updater_ubi.hpp
@@ -35,7 +35,7 @@
 
     void deleteAll() override;
 
-    void freeSpace() override;
+    bool freeSpace() override;
 
     bool isVersionFunctional(const std::string& versionId) override;