diff --git a/src/client/conn.rs b/src/client/conn.rs
index 8d8cc011..a44bc3cc 100644
--- a/src/client/conn.rs
+++ b/src/client/conn.rs
@@ -967,7 +967,6 @@ impl Builder {
                     if opts.h1_title_case_headers {
                         conn.set_title_case_headers();
                     }
-                    #[cfg(feature = "ffi")]
                     if opts.h1_preserve_header_case {
                         conn.set_preserve_header_case();
                     }