diff --git a/src/or/circuitmux.c b/src/or/circuitmux.c
index 71bc4efc4a..7175b6bf13 100644
--- a/src/or/circuitmux.c
+++ b/src/or/circuitmux.c
@@ -621,8 +621,8 @@ circuitmux_clear_policy(circuitmux_t *cmux)
  * Return the policy currently installed on a circuitmux_t
  */
 
-const circuitmux_policy_t *
-circuitmux_get_policy(circuitmux_t *cmux)
+MOCK_IMPL(const circuitmux_policy_t *,
+circuitmux_get_policy, (circuitmux_t *cmux))
 {
   tor_assert(cmux);
 
@@ -1961,8 +1961,8 @@ circuitmux_count_queued_destroy_cells(const channel_t *chan,
  * support the cmp_cmux method, return 0.
  */
 
-int
-circuitmux_compare_muxes(circuitmux_t *cmux_1, circuitmux_t *cmux_2)
+MOCK_IMPL(int,
+circuitmux_compare_muxes, (circuitmux_t *cmux_1, circuitmux_t *cmux_2))
 {
   const circuitmux_policy_t *policy;
 
diff --git a/src/or/circuitmux.h b/src/or/circuitmux.h
index 9a5ea7d675..00707d97e2 100644
--- a/src/or/circuitmux.h
+++ b/src/or/circuitmux.h
@@ -108,7 +108,8 @@ void circuitmux_free(circuitmux_t *cmux);
 
 /* Policy control */
 void circuitmux_clear_policy(circuitmux_t *cmux);
-const circuitmux_policy_t * circuitmux_get_policy(circuitmux_t *cmux);
+MOCK_DECL(const circuitmux_policy_t *,
+          circuitmux_get_policy, (circuitmux_t *cmux));
 void circuitmux_set_policy(circuitmux_t *cmux,
                            const circuitmux_policy_t *pol);
 
@@ -152,7 +153,8 @@ void circuitmux_mark_destroyed_circids_usable(circuitmux_t *cmux,
                                               channel_t *chan);
 
 /* Optional interchannel comparisons for scheduling */
-int circuitmux_compare_muxes(circuitmux_t *cmux_1, circuitmux_t *cmux_2);
+MOCK_DECL(int, circuitmux_compare_muxes,
+          (circuitmux_t *cmux_1, circuitmux_t *cmux_2));
 
 #endif /* TOR_CIRCUITMUX_H */