diff --git a/core/src/test/scala/sttp/client4/testing/HttpTest.scala b/core/src/test/scala/sttp/client4/testing/HttpTest.scala
index 567688c8a..4c24dff7f 100644
--- a/core/src/test/scala/sttp/client4/testing/HttpTest.scala
+++ b/core/src/test/scala/sttp/client4/testing/HttpTest.scala
@@ -183,7 +183,7 @@ trait HttpTest[F[_]]
         }
         .toFuture()
         .map(
-          _ shouldBe "sttp.client4.ResponseException.UnexpectedStatusCode: statusCode: 400, response: POST /echo/custom_status/400 this is the body"
+          _ shouldBe "sttp.client4.ResponseException$UnexpectedStatusCode: statusCode: 400, response: POST /echo/custom_status/400 this is the body"
         )
     }
 
diff --git a/core/src/test/scala/sttp/client4/testing/streaming/StreamingTest.scala b/core/src/test/scala/sttp/client4/testing/streaming/StreamingTest.scala
index 8af2228c4..f21b8e0d4 100644
--- a/core/src/test/scala/sttp/client4/testing/streaming/StreamingTest.scala
+++ b/core/src/test/scala/sttp/client4/testing/streaming/StreamingTest.scala
@@ -286,7 +286,7 @@ abstract class StreamingTest[F[_], S]
       }
       .toFuture()
       .map(
-        _ shouldBe "sttp.client4.ResponseException.UnexpectedStatusCode: statusCode: 400, response: POST /echo/custom_status/400 streaming test"
+        _ shouldBe "sttp.client4.ResponseException$UnexpectedStatusCode: statusCode: 400, response: POST /echo/custom_status/400 streaming test"
       )
   }