diff --git a/codegen/src/ops.rs b/codegen/src/ops.rs
index 9c5e3846..fd71e35e 100644
--- a/codegen/src/ops.rs
+++ b/codegen/src/ops.rs
@@ -627,9 +627,11 @@ fn codegen_op_http_call(op: &Operation) {
 
     if op.name == "GetObject" {
         g!("resp.headers.extend(overrided_headers);");
+        g!("super::get_object::merge_custom_headers(&mut resp, s3_resp.headers);");
+    } else {
+        g!("resp.headers.extend(s3_resp.headers);");
     }
 
-    g!("resp.headers.extend(s3_resp.headers);");
     g!("resp.extensions.extend(s3_resp.extensions);");
     g!("Ok(resp)");
 
diff --git a/crates/s3s/src/ops/generated.rs b/crates/s3s/src/ops/generated.rs
index 0568aa33..f8092738 100644
--- a/crates/s3s/src/ops/generated.rs
+++ b/crates/s3s/src/ops/generated.rs
@@ -2558,7 +2558,7 @@ impl super::Operation for GetObject {
         };
         let mut resp = Self::serialize_http(s3_resp.output)?;
         resp.headers.extend(overrided_headers);
-        resp.headers.extend(s3_resp.headers);
+        super::get_object::merge_custom_headers(&mut resp, s3_resp.headers);
         resp.extensions.extend(s3_resp.extensions);
         Ok(resp)
     }
diff --git a/crates/s3s/src/ops/get_object.rs b/crates/s3s/src/ops/get_object.rs
index aae79e85..2139d919 100644
--- a/crates/s3s/src/ops/get_object.rs
+++ b/crates/s3s/src/ops/get_object.rs
@@ -2,10 +2,13 @@ use crate::dto::GetObjectInput;
 use crate::dto::Timestamp;
 use crate::dto::TimestampFormat;
 use crate::header;
+use crate::http::Response;
 use crate::utils::format::fmt_timestamp;
 use crate::S3Request;
 use crate::S3Result;
 
+use hyper::header::CONTENT_LENGTH;
+use hyper::header::TRANSFER_ENCODING;
 use hyper::http::HeaderName;
 use hyper::http::HeaderValue;
 use hyper::HeaderMap;
@@ -42,3 +45,14 @@ fn add_ts(map: &mut HeaderMap<HeaderValue>, name: HeaderName, value: Option<&Tim
     }
     Ok(())
 }
+
+pub fn merge_custom_headers(resp: &mut Response, headers: HeaderMap<HeaderValue>) {
+    resp.headers.extend(headers);
+
+    // special case for https://github.com/Nugine/s3s/issues/80
+    if let Some(val) = resp.headers.get(TRANSFER_ENCODING) {
+        if val.as_bytes() == b"chunked" {
+            resp.headers.remove(CONTENT_LENGTH);
+        }
+    }
+}