diff --git a/src/call_with_lock.cc b/src/call_with_lock.cc
deleted file mode 100644
index 82a9c49..0000000
--- a/src/call_with_lock.cc
+++ /dev/null
@@ -1,8 +0,0 @@
-// This file is under GNU General Public License 3.0
-// see LICENSE.txt
-
-#include "call_with_lock.hh"
-
-namespace pEp {
-    std::mutex call_with_lock_mutex;
-}
diff --git a/src/call_with_lock.hh b/src/call_with_lock.hh
deleted file mode 100644
index 7e38dae..0000000
--- a/src/call_with_lock.hh
+++ /dev/null
@@ -1,26 +0,0 @@
-// This file is under GNU General Public License 3.0
-// see LICENSE.txt
-
-#ifndef LIBPEPADAPTER_CALL_WITH_LOCK_HH
-#define LIBPEPADAPTER_CALL_WITH_LOCK_HH
-
-#include <mutex>
-
-namespace pEp {
-    extern std::mutex call_with_lock_mutex;
-
-    // TODO: use && and std::forward<> to avoid copying of the arguments.
-    // It is not relevant, yet, because at the moment we use this function
-    // template only for init() and release() which have cheap-to-copy pointer
-    // parameters only
-    template<class R, class... Args>
-    R call_with_lock(R (*fn)(Args...), Args... args)
-    {
-        std::lock_guard<std::mutex> L(call_with_lock_mutex);
-        return fn(args...);
-    }
-
-
-} // namespace pEp
-
-#endif // LIBPEPADAPTER_CALL_WITH_LOCK_HH