diff --git a/c302.c b/c302.c
index c7bb28d..01da61c 100644
--- a/c302.c
+++ b/c302.c
@@ -6,7 +6,7 @@
 #include <time.h>
 #include "c302.h"
 
-static void http_error(ERRCODE code, char* msg) {
+static void http_error(errcode_enum_t code, char* msg) {
     uint32_t len = strlen(msg) + typel[code];
     char* str = malloc(len);
     sprintf(str, types[code], msg);
diff --git a/c302.h b/c302.h
index 1a0f761..cfff927 100644
--- a/c302.h
+++ b/c302.h
@@ -14,8 +14,8 @@
 #define H500 "HTTP/1.0 500 Internal Server Error\r\nContent-Type: text/html\r\n\r\n<P>%s\r\n"
 const char* types[] = {H400, H404, H500};
 const uint8_t typel[] = {59, 111, 69};
-enum ERRCODE {HTTP400, HTTP404, HTTP500};
-typedef enum ERRCODE ERRCODE;
+enum errcode_enum_t {HTTP400, HTTP404, HTTP500};
+typedef enum errcode_enum_t errcode_enum_t;
 
 static const char* urls[] = {
     "https://bocchi.rocks/assets/img/page/character/hitori/main.png",   // 後藤ひとり