diff --git a/src/ui/chatwin.c b/src/ui/chatwin.c
index fbcc1587..b375fb8a 100644
--- a/src/ui/chatwin.c
+++ b/src/ui/chatwin.c
@@ -403,7 +403,7 @@ chatwin_incoming_msg(ProfChatWin* chatwin, ProfMessage* message, gboolean win_cr
 }
 
 void
-chatwin_outgoing_msg(ProfChatWin* chatwin, const char* const message, char* id, prof_enc_t enc_mode,
+chatwin_outgoing_msg(ProfChatWin* chatwin, const char* const message, const char* id, prof_enc_t enc_mode,
                      gboolean request_receipt, const char* const replace_id)
 {
     assert(chatwin != NULL);
diff --git a/src/ui/ui.h b/src/ui/ui.h
index a8d04ab0..40cee762 100644
--- a/src/ui/ui.h
+++ b/src/ui/ui.h
@@ -127,7 +127,7 @@ ProfChatWin* chatwin_new(const char* const barejid);
 void chatwin_incoming_msg(ProfChatWin* chatwin, ProfMessage* message, gboolean win_created);
 void chatwin_receipt_received(ProfChatWin* chatwin, const char* const id);
 void chatwin_recipient_gone(ProfChatWin* chatwin);
-void chatwin_outgoing_msg(ProfChatWin* chatwin, const char* const message, char* id, prof_enc_t enc_mode, gboolean request_receipt, const char* const replace_id);
+void chatwin_outgoing_msg(ProfChatWin* chatwin, const char* const message, const char* id, prof_enc_t enc_mode, gboolean request_receipt, const char* const replace_id);
 void chatwin_outgoing_carbon(ProfChatWin* chatwin, ProfMessage* message);
 void chatwin_contact_online(ProfChatWin* chatwin, Resource* resource, GDateTime* last_activity);
 void chatwin_contact_offline(ProfChatWin* chatwin, char* resource, char* status);
diff --git a/src/ui/window.c b/src/ui/window.c
index 9cbc4556..45ec5c0a 100644
--- a/src/ui/window.c
+++ b/src/ui/window.c
@@ -1617,7 +1617,7 @@ win_print_http_transfer(ProfWin* window, const char* const message, char* id)
 }
 
 void
-win_print_outgoing_with_receipt(ProfWin* window, const char* show_char, const char* const from, const char* const message, char* id, const char* const replace_id)
+win_print_outgoing_with_receipt(ProfWin* window, const char* show_char, const char* const from, const char* const message, const char* id, const char* const replace_id)
 {
     GDateTime* time = g_date_time_new_now_local();
 
diff --git a/src/ui/window.h b/src/ui/window.h
index 0475cea3..852970ec 100644
--- a/src/ui/window.h
+++ b/src/ui/window.h
@@ -65,7 +65,7 @@ void win_show_status_string(ProfWin* window, const char* const from,
 void win_print_them(ProfWin* window, theme_item_t theme_item, const char* const show_char, int flags, const char* const them);
 void win_print_incoming(ProfWin* window, const char* const from, ProfMessage* message);
 void win_print_outgoing(ProfWin* window, const char* show_char, const char* const id, const char* const replace_id, const char* const message);
-void win_print_outgoing_with_receipt(ProfWin* window, const char* show_char, const char* const from, const char* const message, char* id, const char* const replace_id);
+void win_print_outgoing_with_receipt(ProfWin* window, const char* show_char, const char* const from, const char* const message, const char* id, const char* const replace_id);
 void win_println_incoming_muc_msg(ProfWin* window, char* show_char, int flags, const ProfMessage* const message);
 void win_print_outgoing_muc_msg(ProfWin* window, char* show_char, const char* const me, const char* const id, const char* const replace_id, const char* const message);
 void win_print_history(ProfWin* window, const ProfMessage* const message);
diff --git a/tests/unittests/ui/stub_ui.c b/tests/unittests/ui/stub_ui.c
index 4c6439dd..6ee0ed25 100644
--- a/tests/unittests/ui/stub_ui.c
+++ b/tests/unittests/ui/stub_ui.c
@@ -277,7 +277,7 @@ chatwin_recipient_gone(ProfChatWin* chatwin)
 }
 
 void
-chatwin_outgoing_msg(ProfChatWin* chatwin, const char* const message, char* id, prof_enc_t enc_mode, gboolean request_receipt, const char* const replace_id)
+chatwin_outgoing_msg(ProfChatWin* chatwin, const char* const message, const char* id, prof_enc_t enc_mode, gboolean request_receipt, const char* const replace_id)
 {
 }
 void