diff --git a/src/server/user_mgr.c b/src/server/user_mgr.c
--- a/src/server/user_mgr.c
+++ b/src/server/user_mgr.c
@@ -20,6 +20,9 @@
 #include "user_mgr.h"
 #include "malloc.h"
 #include <string.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
 
 struct user_mgr_info
 {