diff --git a/src/or/dirauth/dirvote.c b/src/or/dirauth/dirvote.c
index 6b7114b141..fd629ca6ff 100644
--- a/src/or/dirauth/dirvote.c
+++ b/src/or/dirauth/dirvote.c
@@ -3892,7 +3892,7 @@ dirvote_format_all_microdesc_vote_lines(const routerinfo_t *ri, time_t now,
 /** Parse and extract all SR commits from <b>tokens</b> and place them in
  *  <b>ns</b>. */
 static void
-extract_shared_random_commits(networkstatus_t *ns, smartlist_t *tokens)
+extract_shared_random_commits(networkstatus_t *ns, const smartlist_t *tokens)
 {
   smartlist_t *chunks = NULL;
 
@@ -3948,7 +3948,7 @@ extract_shared_random_commits(networkstatus_t *ns, smartlist_t *tokens)
  *
  * This also sets the SR participation flag if present in the vote. */
 void
-dirvote_parse_sr_commits(networkstatus_t *ns, smartlist_t *tokens)
+dirvote_parse_sr_commits(networkstatus_t *ns, const smartlist_t *tokens)
 {
   /* Does this authority participates in the SR protocol? */
   directory_token_t *tok = find_opt_by_keyword(tokens, K_SR_FLAG);
diff --git a/src/or/dirauth/dirvote.h b/src/or/dirauth/dirvote.h
index 228121268f..b69bbbf5d9 100644
--- a/src/or/dirauth/dirvote.h
+++ b/src/or/dirauth/dirvote.h
@@ -99,7 +99,7 @@
 time_t dirvote_act(const or_options_t *options, time_t now);
 void dirvote_free_all(void);
 
-void dirvote_parse_sr_commits(networkstatus_t *ns, smartlist_t *tokens);
+void dirvote_parse_sr_commits(networkstatus_t *ns, const smartlist_t *tokens);
 void dirvote_clear_commits(networkstatus_t *ns);
 void dirvote_dirreq_get_status_vote(const char *url, smartlist_t *items,
                                     smartlist_t *dir_items);
@@ -128,7 +128,7 @@ dirvote_free_all(void)
 }
 
 static inline void
-dirvote_parse_sr_commits(networkstatus_t *ns, smartlist_t *tokens)
+dirvote_parse_sr_commits(networkstatus_t *ns, const smartlist_t *tokens)
 {
   (void) ns;
   (void) tokens;