diff --git a/auto_tests/toxav_many_test.c b/auto_tests/toxav_many_test.c
index 2918da8da71..8caa372b519 100644
--- a/auto_tests/toxav_many_test.c
+++ b/auto_tests/toxav_many_test.c
@@ -33,6 +33,12 @@ typedef struct {
     uint32_t friend_number;
 } thread_data;
 
+static uint64_t get_state_clock_callback(Mono_Time *mono_time, void *user_data)
+{
+    const uint64_t *clock = (const uint64_t *)user_data;
+    return *clock;
+}
+
 /**
  * Callbacks
  */
@@ -129,6 +135,13 @@ static void *call_thread(void *pd)
     return nullptr;
 }
 
+static void set_current_time_callback(Tox *tox, uint64_t *clock)
+{
+    // TODO(iphydf): Don't rely on toxcore internals.
+    Mono_Time *mono_time = ((Messenger *)tox)->mono_time;
+    mono_time_set_current_time_callback(mono_time, get_state_clock_callback, clock);
+}
+
 static void test_av_three_calls(void)
 {
     uint32_t index[] = { 1, 2, 3, 4, 5 };
@@ -138,23 +151,32 @@ static void test_av_three_calls(void)
 
     CallControl AliceCC[3], BobsCC[3];
 
+    uint64_t clock;
     {
         Tox_Err_New error;
 
         bootstrap = tox_new_log(nullptr, &error, &index[0]);
         ck_assert(error == TOX_ERR_NEW_OK);
 
+        // TODO(iphydf): Don't rely on toxcore internals.
+        clock = current_time_monotonic(((Messenger *)bootstrap)->mono_time);
+        set_current_time_callback(bootstrap, &clock);
+
         Alice = tox_new_log(nullptr, &error, &index[1]);
         ck_assert(error == TOX_ERR_NEW_OK);
+        set_current_time_callback(Alice, &clock);
 
         Bobs[0] = tox_new_log(nullptr, &error, &index[2]);
         ck_assert(error == TOX_ERR_NEW_OK);
+        set_current_time_callback(Bobs[0], &clock);
 
         Bobs[1] = tox_new_log(nullptr, &error, &index[3]);
         ck_assert(error == TOX_ERR_NEW_OK);
+        set_current_time_callback(Bobs[1], &clock);
 
         Bobs[2] = tox_new_log(nullptr, &error, &index[4]);
         ck_assert(error == TOX_ERR_NEW_OK);
+        set_current_time_callback(Bobs[2], &clock);
     }
 
     printf("Created 5 instances of Tox\n");
@@ -208,7 +230,8 @@ static void test_av_three_calls(void)
             break;
         }
 
-        c_sleep(20);
+        clock += 200;
+        c_sleep(5);
     }
 
     AliceAV = setup_av_instance(Alice, AliceCC);
@@ -245,7 +268,9 @@ static void test_av_three_calls(void)
         tox_iterate(Bobs[0], nullptr);
         tox_iterate(Bobs[1], nullptr);
         tox_iterate(Bobs[2], nullptr);
-        c_sleep(20);
+
+        clock += 100;
+        c_sleep(5);
     } while (time(nullptr) - start_time < 1);
 
     /* Call */
@@ -282,7 +307,8 @@ static void test_av_three_calls(void)
             }
         }
 
-        c_sleep(20);
+        clock += 100;
+        c_sleep(5);
     } while (time(nullptr) - start_time < 3);
 
     /* Hangup */
@@ -302,7 +328,8 @@ static void test_av_three_calls(void)
         tox_iterate(Bobs[1], nullptr);
         tox_iterate(Bobs[2], nullptr);
 
-        c_sleep(20);
+        clock += 100;
+        c_sleep(5);
     } while (time(nullptr) - start_time < 5);
 
     ck_assert(pthread_join(tids[0], &retval) == 0);