diff --git a/include/server.h b/include/server.h
index dd24388e..15908b44 100644
--- a/include/server.h
+++ b/include/server.h
@@ -40,7 +40,8 @@ extern int shutdown_pending;
 extern int update_pending;
 extern int update_running;
 extern empth_rwlock_t *update_lock;
-extern time_t update_time[16];
+#define UPDATE_TIME_LEN 16
+extern time_t update_time[UPDATE_TIME_LEN];
 
 void market_init(void);
 void update_main(void);
diff --git a/src/lib/global/updtime.c b/src/lib/global/updtime.c
index 0c37c6ca..7829ec66 100644
--- a/src/lib/global/updtime.c
+++ b/src/lib/global/updtime.c
@@ -35,4 +35,4 @@
 
 #include "server.h"
 
-time_t update_time[];
+time_t update_time[UPDATE_TIME_LEN];