diff --git a/src/gamelog.h b/src/gamelog.h
--- a/src/gamelog.h
+++ b/src/gamelog.h
@@ -61,4 +61,6 @@ void GamelogTestMode();
 
 bool GamelogGRFBugReverse(uint32 grfid, uint16 internal_id);
 
+void GamelogInfo(struct LoggedAction *gamelog_action, uint gamelog_actions, uint32 *last_ottd_rev, byte *ever_modified, bool *removed_newgrfs);
+
 #endif /* GAMELOG_H */