diff --git a/auto_tests/onion_test.c b/auto_tests/onion_test.c
index 4f129d5d..b5c0d693 100644
--- a/auto_tests/onion_test.c
+++ b/auto_tests/onion_test.c
@@ -26,9 +26,9 @@ static inline IP get_loopback(void)
 #endif
     return ip;
 }
-static void do_onion(Onion *onion)
+static void do_onion(Mono_Time *mono_time, Onion *onion)
 {
-    mono_time_update(onion->mono_time);
+    mono_time_update(mono_time);
 
     networking_poll(onion->net, nullptr);
     do_dht(onion->dht);
@@ -229,16 +229,16 @@ static void test_basic(void)
     handled_test_1 = 0;
 
     do {
-        do_onion(onion1);
-        do_onion(onion2);
+        do_onion(mono_time1, onion1);
+        do_onion(mono_time2, onion2);
     } while (handled_test_1 == 0);
 
     networking_registerhandler(onion1->net, NET_PACKET_ANNOUNCE_RESPONSE_OLD, &handle_test_2, onion1);
     handled_test_2 = 0;
 
     do {
-        do_onion(onion1);
-        do_onion(onion2);
+        do_onion(mono_time1, onion1);
+        do_onion(mono_time2, onion2);
     } while (handled_test_2 == 0);
 
     Onion_Announce *onion1_a = new_onion_announce(log1, mono_time1, onion1->dht);
@@ -260,8 +260,8 @@ static void test_basic(void)
     handled_test_3 = 0;
 
     do {
-        do_onion(onion1);
-        do_onion(onion2);
+        do_onion(mono_time1, onion1);
+        do_onion(mono_time2, onion2);
         c_sleep(50);
     } while (handled_test_3 == 0);
 
@@ -278,8 +278,8 @@ static void test_basic(void)
                           dht_get_self_public_key(onion1->dht), s);
 
     do {
-        do_onion(onion1);
-        do_onion(onion2);
+        do_onion(mono_time1, onion1);
+        do_onion(mono_time2, onion2);
         c_sleep(50);
     } while (memcmp(onion_announce_entry_public_key(onion2_a, ONION_ANNOUNCE_MAX_ENTRIES - 2),
                     dht_get_self_public_key(onion1->dht),
@@ -303,8 +303,8 @@ static void test_basic(void)
     handled_test_4 = 0;
 
     do {
-        do_onion(onion1);
-        do_onion(onion2);
+        do_onion(mono_time1, onion1);
+        do_onion(mono_time2, onion2);
         c_sleep(50);
     } while (handled_test_4 == 0);
 
diff --git a/toxcore/onion.c b/toxcore/onion.c
index 9e327fc0..25218a00 100644
--- a/toxcore/onion.c
+++ b/toxcore/onion.c
@@ -641,7 +641,7 @@ void set_callback_handle_recv_1(Onion *onion, onion_recv_1_cb *function, void *o
     onion->callback_object = object;
 }
 
-Onion *new_onion(const Logger *log, Mono_Time *mono_time, DHT *dht)
+Onion *new_onion(const Logger *log, const Mono_Time *mono_time, DHT *dht)
 {
     if (dht == nullptr) {
         return nullptr;
diff --git a/toxcore/onion.h b/toxcore/onion.h
index cb32cf17..24a95fe1 100644
--- a/toxcore/onion.h
+++ b/toxcore/onion.h
@@ -17,7 +17,7 @@ typedef int onion_recv_1_cb(void *object, const IP_Port *dest, const uint8_t *da
 
 typedef struct Onion {
     const Logger *log;
-    Mono_Time *mono_time;
+    const Mono_Time *mono_time;
     DHT *dht;
     Networking_Core *net;
     uint8_t secret_symmetric_key[CRYPTO_SYMMETRIC_KEY_SIZE];
@@ -143,7 +143,7 @@ non_null(1) nullable(2, 3)
 void set_callback_handle_recv_1(Onion *onion, onion_recv_1_cb *function, void *object);
 
 non_null()
-Onion *new_onion(const Logger *log, Mono_Time *mono_time, DHT *dht);
+Onion *new_onion(const Logger *log, const Mono_Time *mono_time, DHT *dht);
 
 non_null()
 void kill_onion(Onion *onion);
diff --git a/toxcore/onion_announce.c b/toxcore/onion_announce.c
index f0c1f727..1b781a80 100644
--- a/toxcore/onion_announce.c
+++ b/toxcore/onion_announce.c
@@ -44,7 +44,7 @@ typedef struct Onion_Announce_Entry {
 
 struct Onion_Announce {
     const Logger *log;
-    Mono_Time *mono_time;
+    const Mono_Time *mono_time;
     DHT     *dht;
     Networking_Core *net;
     Onion_Announce_Entry entries[ONION_ANNOUNCE_MAX_ENTRIES];
@@ -648,7 +648,7 @@ static int handle_data_request(void *object, const IP_Port *source, const uint8_
     return 0;
 }
 
-Onion_Announce *new_onion_announce(const Logger *log, Mono_Time *mono_time, DHT *dht)
+Onion_Announce *new_onion_announce(const Logger *log, const Mono_Time *mono_time, DHT *dht)
 {
     if (dht == nullptr) {
         return nullptr;
diff --git a/toxcore/onion_announce.h b/toxcore/onion_announce.h
index f81defe3..32ad3cd8 100644
--- a/toxcore/onion_announce.h
+++ b/toxcore/onion_announce.h
@@ -128,7 +128,7 @@ void onion_announce_extra_data_callback(Onion_Announce *onion_a, uint16_t extra_
                                         pack_extra_data_cb *extra_data_callback, void *extra_data_object);
 
 non_null()
-Onion_Announce *new_onion_announce(const Logger *log, Mono_Time *mono_time, DHT *dht);
+Onion_Announce *new_onion_announce(const Logger *log, const Mono_Time *mono_time, DHT *dht);
 
 non_null()
 void kill_onion_announce(Onion_Announce *onion_a);
diff --git a/toxcore/onion_client.c b/toxcore/onion_client.c
index 3600a45d..6345937e 100644
--- a/toxcore/onion_client.c
+++ b/toxcore/onion_client.c
@@ -98,7 +98,7 @@ typedef struct Onion_Data_Handler {
 } Onion_Data_Handler;
 
 struct Onion_Client {
-    Mono_Time *mono_time;
+    const Mono_Time *mono_time;
     const Logger *logger;
 
     DHT     *dht;
@@ -1920,7 +1920,7 @@ void do_onion_client(Onion_Client *onion_c)
     onion_c->last_run = mono_time_get(onion_c->mono_time);
 }
 
-Onion_Client *new_onion_client(const Logger *logger, Mono_Time *mono_time, Net_Crypto *c)
+Onion_Client *new_onion_client(const Logger *logger, const Mono_Time *mono_time, Net_Crypto *c)
 {
     if (c == nullptr) {
         return nullptr;
diff --git a/toxcore/onion_client.h b/toxcore/onion_client.h
index d541982e..ad68bd08 100644
--- a/toxcore/onion_client.h
+++ b/toxcore/onion_client.h
@@ -197,7 +197,7 @@ non_null()
 void do_onion_client(Onion_Client *onion_c);
 
 non_null()
-Onion_Client *new_onion_client(const Logger *logger, Mono_Time *mono_time, Net_Crypto *c);
+Onion_Client *new_onion_client(const Logger *logger, const Mono_Time *mono_time, Net_Crypto *c);
 
 non_null()
 void kill_onion_client(Onion_Client *onion_c);