diff --git a/repos/os/src/lib/vfs/ram_file_system.h b/repos/os/src/lib/vfs/ram_file_system.h
index 5f903885cb..0dad78afb8 100644
--- a/repos/os/src/lib/vfs/ram_file_system.h
+++ b/repos/os/src/lib/vfs/ram_file_system.h
@@ -27,8 +27,8 @@ namespace Vfs_ram {
 	using namespace Genode;
 	using namespace Vfs;
 	using namespace Ram_fs;
-	using File_system::Chunk;
-	using File_system::Chunk_index;
+	using ::File_system::Chunk;
+	using ::File_system::Chunk_index;
 
 	struct Io_handle;
 	struct Watch_handle;