diff --git a/src/server/mysql.h b/src/server/mysql.h
--- a/src/server/mysql.h
+++ b/src/server/mysql.h
@@ -52,7 +52,7 @@ void finish_frame(distrend_mysql_conn_t 
 /**
    Mark a frame as started in the database and save the time at which it started.
  */
-int start_frame(distrend_mysql_conn_t conn, int32_t slavekey, int32_t jobkey, int32_t framenum);
+void start_frame(distrend_mysql_conn_t conn, int32_t slavekey, int32_t jobkey, int32_t framenum);
 
 /**
    Changes the priority of an existing (and maybe running) job. @arg head I may end up changing the head if job == head