diff --git a/src/client-ocurl-lwt/opentelemetry_client_ocurl_lwt.ml b/src/client-ocurl-lwt/opentelemetry_client_ocurl_lwt.ml
index 348fa980..8502db39 100644
--- a/src/client-ocurl-lwt/opentelemetry_client_ocurl_lwt.ml
+++ b/src/client-ocurl-lwt/opentelemetry_client_ocurl_lwt.ml
@@ -117,7 +117,7 @@ end = struct
              \  %s\n\
              \  curl code: %s\n\
              \  url: %s\n\
-              \%!"
+              %!"
              msg (Curl.strerror code) url)
       in
       Lwt.return @@ Error err