diff --git a/desktop/history_core.c b/desktop/history_core.c
index 11db6b7f9..95d28fb3d 100644
--- a/desktop/history_core.c
+++ b/desktop/history_core.c
@@ -224,7 +224,7 @@ struct history_entry *history_clone_entry(struct history *history,
  */
 
 void history_add(struct history *history, hlcache_handle *content,
-		char *frag_id)
+		const char *frag_id)
 {
 	struct history_entry *entry;
 	char *url;
diff --git a/desktop/history_core.h b/desktop/history_core.h
index 5a75e4a95..76f39a7c7 100644
--- a/desktop/history_core.h
+++ b/desktop/history_core.h
@@ -34,7 +34,7 @@ struct redraw_context;
 struct history *history_create(void);
 struct history *history_clone(struct history *history);
 void history_add(struct history *history, struct hlcache_handle *content,
-		char *frag_id);
+		const char *frag_id);
 void history_update(struct history *history, struct hlcache_handle *content);
 void history_destroy(struct history *history);
 void history_back(struct browser_window *bw, struct history *history);