diff --git a/README.md b/README.md
index 17678e8..49fc2d9 100644
--- a/README.md
+++ b/README.md
@@ -82,7 +82,7 @@ services:
     depends_on:
       - redis
     environment:
-      SIZE_LIMIT: 4M
+      SIZE_LIMIT: 4 MiB
     ports:
       - 80:5000
 ```
diff --git a/README_zh-CN.md b/README_zh-CN.md
index c9f4c7f..e91f001 100644
--- a/README_zh-CN.md
+++ b/README_zh-CN.md
@@ -78,7 +78,7 @@ services:
     depends_on:
       - redis
     environment:
-      SIZE_LIMIT: 4M
+      SIZE_LIMIT: 4 MiB
     ports:
       - 80:5000
 ```
diff --git a/backend/src/config.rs b/backend/src/config.rs
index 3176709..ff87c78 100644
--- a/backend/src/config.rs
+++ b/backend/src/config.rs
@@ -9,10 +9,10 @@ lazy_static! {
 
 // CONFIG
 lazy_static! {
-  pub static ref LIMIT: u32 =
+  pub static ref LIMIT: usize =
     Byte::from_str(std::env::var("SIZE_LIMIT").unwrap_or("1 KiB".to_string()))
       .unwrap()
-      .get_bytes() as u32;
+      .get_bytes() as usize;
   pub static ref MAX_VIEWS: u32 = std::env::var("MAX_VIEWS")
     .unwrap_or("100".to_string())
     .parse()
diff --git a/backend/src/size.rs b/backend/src/size.rs
index 3fd3f23..90f20d9 100644
--- a/backend/src/size.rs
+++ b/backend/src/size.rs
@@ -1,18 +1,11 @@
+use crate::config;
 use actix_web::web;
-use byte_unit::Byte;
 use mime;
 
-lazy_static! {
-    pub static ref LIMIT: usize =
-        Byte::from_str(std::env::var("SIZE_LIMIT").unwrap_or("1 KiB".to_string()))
-            .unwrap()
-            .get_bytes() as usize;
-}
-
 pub fn init(cfg: &mut web::ServiceConfig) {
-    let json = web::JsonConfig::default().limit(*LIMIT);
+    let json = web::JsonConfig::default().limit(*config::LIMIT);
     let plain = web::PayloadConfig::default()
-        .limit(*LIMIT)
+        .limit(*config::LIMIT)
         .mimetype(mime::STAR_STAR);
     cfg.app_data(json).app_data(plain);
 }
diff --git a/backend/src/status/routes.rs b/backend/src/status/routes.rs
index d174c2c..bbb8a43 100644
--- a/backend/src/status/routes.rs
+++ b/backend/src/status/routes.rs
@@ -7,7 +7,7 @@ use crate::status::Status;
 async fn get_status() -> impl Responder {
     return HttpResponse::Ok().json(Status {
         version: config::VERSION.to_string(),
-        max_size: *config::LIMIT,
+        max_size: *config::LIMIT as u32,
         max_views: *config::MAX_VIEWS,
         max_expiration: *config::MAX_EXPIRATION,
         allow_advanced: *config::ALLOW_ADVANCED,
diff --git a/docker-compose.yml b/docker-compose.yml
index a7616b7..1dfdfb9 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -14,6 +14,6 @@ services:
     depends_on:
       - redis
     environment:
-      SIZE_LIMIT: 128M
+      SIZE_LIMIT: 128 MiB
     ports:
       - 80:5000