diff --git a/src/db/plugins/simple/SimpleDatabasePlugin.hxx b/src/db/plugins/simple/SimpleDatabasePlugin.hxx
index 5b544251b..6cc2b4fd0 100644
--- a/src/db/plugins/simple/SimpleDatabasePlugin.hxx
+++ b/src/db/plugins/simple/SimpleDatabasePlugin.hxx
@@ -21,13 +21,13 @@ class DatabaseListener;
 class PrefixedLightSong;
 
 class SimpleDatabase : public Database {
-	AllocatedPath path;
+	const AllocatedPath path;
 	std::string path_utf8;
 
 	/**
 	 * The path where cache files for Mount() are located.
 	 */
-	AllocatedPath cache_path;
+	const AllocatedPath cache_path;
 
 	Directory *root;