diff --git a/include/constant.h b/include/constant.h
index a1dbc16..63f4f53 100644
--- a/include/constant.h
+++ b/include/constant.h
@@ -10,6 +10,7 @@
 #define DOMESTIC_PORT 4053
 #define FOREIGN_PORT  6053
 
+#define RESTART_DELAY    1
 #define DIVERTER_TIMEOUT 6
 
 #define VERSION     "1.3.0-rc1"
diff --git a/src/utils/process.c b/src/utils/process.c
index c48c886..5eadb3a 100644
--- a/src/utils/process.c
+++ b/src/utils/process.c
@@ -164,8 +164,7 @@ void get_sub_exit() { // catch child process exit
             char *exit_msg = get_exit_msg(status);
             log_warn("%s (PID = %d) -> %s", (*proc)->name, (*proc)->pid, exit_msg);
             free(exit_msg);
-            // TODO: delay with global const
-            sleep(1); // reduce restart frequency
+            sleep(RESTART_DELAY); // reduce restart frequency
             process_exec(*proc);
             log_info("%s restart complete", (*proc)->name);
             return; // skip following check