diff --git a/src/Adapter.hh b/src/Adapter.hh
index f394010..286ac36 100644
--- a/src/Adapter.hh
+++ b/src/Adapter.hh
@@ -126,7 +126,7 @@ namespace pEp {
                 SyncModes sync_mode,
                 bool adapter_manages_sync_thread);
 
-            using SessionPtr = std::unique_ptr<_pEpSession, std::function<void(PEP_SESSION)>>;
+            using SessionPtr = std::unique_ptr<_pEpSession, std::function<void(::PEP_SESSION)>>;
             SessionPtr _session = nullptr;
         };
 
@@ -148,4 +148,4 @@ namespace pEp {
 
 #include "Adapter.hxx"
 
-#endif // LIBPEPADAPTER_ADAPTER_HH
\ No newline at end of file
+#endif // LIBPEPADAPTER_ADAPTER_HH