diff --git a/src/or/dirauth/dirvote.c b/src/or/dirauth/dirvote.c
index 683cfdfcac..dc978f26e9 100644
--- a/src/or/dirauth/dirvote.c
+++ b/src/or/dirauth/dirvote.c
@@ -94,6 +94,30 @@ static void dirvote_clear_votes(int all_votes);
 static int dirvote_compute_consensuses(void);
 static int dirvote_publish_consensus(void);
 
+/* =====
+ * Certificate functions
+ * ===== */
+
+/** Allocate and return a new authority_cert_t with the same contents as
+ * <b>cert</b>. */
+STATIC authority_cert_t *
+authority_cert_dup(authority_cert_t *cert)
+{
+  authority_cert_t *out = tor_malloc(sizeof(authority_cert_t));
+  tor_assert(cert);
+
+  memcpy(out, cert, sizeof(authority_cert_t));
+  /* Now copy pointed-to things. */
+  out->cache_info.signed_descriptor_body =
+    tor_strndup(cert->cache_info.signed_descriptor_body,
+                cert->cache_info.signed_descriptor_len);
+  out->cache_info.saved_location = SAVED_NOWHERE;
+  out->identity_key = crypto_pk_dup_key(cert->identity_key);
+  out->signing_key = crypto_pk_dup_key(cert->signing_key);
+
+  return out;
+}
+
 /* =====
  * Voting
  * =====*/
@@ -4472,7 +4496,7 @@ dirserv_generate_networkstatus_vote_obj(crypto_pk_t *private_key,
 
   v3_out->voters = smartlist_new();
   smartlist_add(v3_out->voters, voter);
-  v3_out->cert = dirvote_authority_cert_dup(cert);
+  v3_out->cert = authority_cert_dup(cert);
   v3_out->routerstatus_list = routerstatuses;
   /* Note: networkstatus_digest is unset; it won't get set until we actually
    * format the vote. */
diff --git a/src/or/dirauth/dirvote.h b/src/or/dirauth/dirvote.h
index 59cfd6b999..2c3b1a1cf0 100644
--- a/src/or/dirauth/dirvote.h
+++ b/src/or/dirauth/dirvote.h
@@ -202,6 +202,8 @@ vote_microdesc_hash_t *dirvote_format_all_microdesc_vote_lines(
  */
 #ifdef DIRVOTE_PRIVATE
 
+/* Cert manipulation */
+STATIC authority_cert_t *authority_cert_dup(authority_cert_t *cert);
 STATIC int32_t dirvote_get_intermediate_param_value(
                                    const smartlist_t *param_list,
                                    const char *keyword,
diff --git a/src/or/dirvote_common.c b/src/or/dirvote_common.c
index 9d2c867c83..a28a441d64 100644
--- a/src/or/dirvote_common.c
+++ b/src/or/dirvote_common.c
@@ -193,27 +193,3 @@ dirvote_get_voter_sig_by_alg(const networkstatus_voter_info_t *voter,
   return NULL;
 }
 
-/* =====
- * Certificate functions
- * ===== */
-
-/** Allocate and return a new authority_cert_t with the same contents as
- * <b>cert</b>. */
-authority_cert_t *
-dirvote_authority_cert_dup(authority_cert_t *cert)
-{
-  authority_cert_t *out = tor_malloc(sizeof(authority_cert_t));
-  tor_assert(cert);
-
-  memcpy(out, cert, sizeof(authority_cert_t));
-  /* Now copy pointed-to things. */
-  out->cache_info.signed_descriptor_body =
-    tor_strndup(cert->cache_info.signed_descriptor_body,
-                cert->cache_info.signed_descriptor_len);
-  out->cache_info.saved_location = SAVED_NOWHERE;
-  out->identity_key = crypto_pk_dup_key(cert->identity_key);
-  out->signing_key = crypto_pk_dup_key(cert->signing_key);
-
-  return out;
-}
-
diff --git a/src/or/dirvote_common.h b/src/or/dirvote_common.h
index 07e6259377..857b8497ee 100644
--- a/src/or/dirvote_common.h
+++ b/src/or/dirvote_common.h
@@ -62,8 +62,5 @@ document_signature_t *dirvote_get_voter_sig_by_alg(
                            const networkstatus_voter_info_t *voter,
                            digest_algorithm_t alg);
 
-/* Cert manipulation */
-authority_cert_t *dirvote_authority_cert_dup(authority_cert_t *cert);
-
 #endif /* TOR_DIRVOTE_COMMON_H */
 
diff --git a/src/test/test_dir_common.c b/src/test/test_dir_common.c
index 8c6d99ccec..02d3295ca6 100644
--- a/src/test/test_dir_common.c
+++ b/src/test/test_dir_common.c
@@ -307,7 +307,7 @@ dir_common_construct_vote_1(networkstatus_t **vote, authority_cert_t *cert,
    * Set up a vote; generate it; try to parse it.
    */
   smartlist_add((*vote)->voters, voter);
-  (*vote)->cert = dirvote_authority_cert_dup(cert);
+  (*vote)->cert = authority_cert_dup(cert);
   smartlist_split_string((*vote)->net_params, "circuitwindow=101 foo=990",
                          NULL, 0, 0);
   *n_vrs = 0;
@@ -356,7 +356,7 @@ dir_common_construct_vote_2(networkstatus_t **vote, authority_cert_t *cert,
    * Set up a vote; generate it; try to parse it.
    */
   smartlist_add((*vote)->voters, voter);
-  (*vote)->cert = dirvote_authority_cert_dup(cert);
+  (*vote)->cert = authority_cert_dup(cert);
   if (! (*vote)->net_params)
     (*vote)->net_params = smartlist_new();
   smartlist_split_string((*vote)->net_params,
@@ -407,7 +407,7 @@ dir_common_construct_vote_3(networkstatus_t **vote, authority_cert_t *cert,
    * Set up a vote; generate it; try to parse it.
    */
   smartlist_add((*vote)->voters, voter);
-  (*vote)->cert = dirvote_authority_cert_dup(cert);
+  (*vote)->cert = authority_cert_dup(cert);
   smartlist_split_string((*vote)->net_params, "circuitwindow=80 foo=660",
                          NULL, 0, 0);
   /* add routerstatuses */