diff --git a/src/matrix-api.c b/src/matrix-api.c
index 63e9f05..4b77fa6 100644
--- a/src/matrix-api.c
+++ b/src/matrix-api.c
@@ -455,7 +455,6 @@ matrix_api_send_message(MatrixAPI *api,
  * @room_id: the room to send the emote to
  * @event_type: the type of the event to send
  * @content: the content of the event as a #JsonNode
- * @txn_id: the transaction ID to use
  *
  * Send a message event to the room.
  */
@@ -465,8 +464,7 @@ matrix_api_send_message_event(MatrixAPI *api,
                               gpointer user_data,
                               gchar *room_id,
                               gchar *event_type,
-                              JsonNode *content,
-                              guint txn_id)
+                              JsonNode *content)
 {
     g_return_if_fail(MATRIX_IS_API(api));
 
@@ -475,8 +473,7 @@ matrix_api_send_message_event(MatrixAPI *api,
                              callback, user_data,
                              room_id,
                              event_type,
-                             content,
-                             txn_id);
+                             content);
 }
 
 /**
diff --git a/src/matrix-api.h b/src/matrix-api.h
index 190f9b1..2c170fa 100644
--- a/src/matrix-api.h
+++ b/src/matrix-api.h
@@ -81,8 +81,7 @@ struct _MatrixAPIInterface {
                                gpointer user_data,
                                gchar *room_id,
                                gchar *event_type,
-                               JsonNode *content,
-                               guint txn_id);
+                               JsonNode *content);
     void (*send_message)(MatrixAPI *api,
                          MatrixAPICallback callback,
                          gpointer user_data,
@@ -202,8 +201,7 @@ void matrix_api_send_message_event(MatrixAPI *api,
                                    gpointer user_data,
                                    gchar *room_id,
                                    gchar *event_type,
-                                   JsonNode *content,
-                                   guint txn_id);
+                                   JsonNode *content);
 void matrix_api_send_message(MatrixAPI *api,
                              MatrixAPICallback callback,
                              gpointer user_data,