diff --git a/repos/base/src/include/base/internal/unmanaged_singleton.h b/repos/base/src/include/base/internal/unmanaged_singleton.h
index e56d9302e0..b140f6abe1 100644
--- a/repos/base/src/include/base/internal/unmanaged_singleton.h
+++ b/repos/base/src/include/base/internal/unmanaged_singleton.h
@@ -55,7 +55,7 @@ struct Unmanaged_singleton_constructor
 	 * Call the constructor of 'T' with arguments 'args' at 'dst'
 	 */
 	template <typename T, typename... ARGS>
-	static void call(char * const dst, ARGS... args) { new (dst) T(args...); }
+	static void call(char * const dst, ARGS &&... args) { new (dst) T(args...); }
 };
 
 /**
@@ -68,7 +68,7 @@ struct Unmanaged_singleton_constructor
  * \return  object pointer
  */
 template <typename T, int ALIGNMENT = sizeof(Genode::addr_t), typename... ARGS>
-static inline T * unmanaged_singleton(ARGS... args)
+static inline T * unmanaged_singleton(ARGS &&... args)
 {
 	/*
 	 * Each instantiation of the function template with a different type 'T'