diff --git a/CHANGES.md b/CHANGES.md
index d9984224..87c021b1 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,6 +1,11 @@
 # Changes
 
 ## Unreleased - 2020-xx-xx
+### Fixed
+* added the actual parsing error to `test::read_body_json` [#1812]
+
+[#1812]: https://github.com/actix/actix-web/pull/1812
+
 
 
 ## 3.3.2 - 2020-12-01
diff --git a/src/test.rs b/src/test.rs
index ee51b71e..cff6c3e5 100644
--- a/src/test.rs
+++ b/src/test.rs
@@ -269,8 +269,9 @@ where
 {
     let body = read_body(res).await;
 
-    serde_json::from_slice(&body)
-        .unwrap_or_else(|_| panic!("read_response_json failed during deserialization"))
+    serde_json::from_slice(&body).unwrap_or_else(|e| {
+        panic!("read_response_json failed during deserialization: {}", e)
+    })
 }
 
 pub async fn load_stream<S>(mut stream: S) -> Result<Bytes, Error>