diff --git a/interop/tapir/src/main/scala/caliban/interop/tapir/TapirAdapter.scala b/interop/tapir/src/main/scala/caliban/interop/tapir/TapirAdapter.scala
index 7a4d48783..cb942053d 100644
--- a/interop/tapir/src/main/scala/caliban/interop/tapir/TapirAdapter.scala
+++ b/interop/tapir/src/main/scala/caliban/interop/tapir/TapirAdapter.scala
@@ -139,7 +139,7 @@ object TapirAdapter {
           encodeTextEventStreamResponse(resp)
         )
       case resp                                                 =>
-        val isBadRequest = response.errors.contains(HttpRequestMethod.MutationOverGetError)
+        val isBadRequest = response.errors.contains(HttpRequestMethod.MutationOverGetError: Any)
         (
           MediaType.ApplicationJson,
           if (isBadRequest) StatusCode.BadRequest else StatusCode.Ok,