diff --git a/include/client.h b/include/client.h
index 024de4c..80192af 100644
--- a/include/client.h
+++ b/include/client.h
@@ -5,7 +5,6 @@
 #include <sr_keychain.h>
 
 #ifndef NDEBUG
-// #define TARGET_URL "http://127.0.0.1:8888"
 #define TARGET_URL "http://judge_ui:8888"
 #else
 #define TARGET_URL "https://judge.eluminatis-of-lu.com"
@@ -13,13 +12,13 @@
 
 #define target_url(x) TARGET_URL "/" x
 
-CURL *curl;
 struct response
 {
     char *memory;
     size_t size;
 };
-struct response response_body;
+extern struct response response_body;
+extern CURL *curl;
 
 void init_curl(void);
 void cleanup_curl(void);
diff --git a/src/client.c b/src/client.c
index 38dde1e..2dc9c84 100644
--- a/src/client.c
+++ b/src/client.c
@@ -1,8 +1,11 @@
 #include <client.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 
 struct curl_slist *headers = NULL;
+CURL *curl = NULL;
+struct response response_body = {0};
 
 static size_t
 mem_cb(void *contents, size_t size, size_t nmemb, void *userp)