diff --git a/retrofit2/src/main/java/com/linecorp/armeria/client/retrofit2/ArmeriaRetrofitBuilder.java b/retrofit2/src/main/java/com/linecorp/armeria/client/retrofit2/ArmeriaRetrofitBuilder.java
index 84530e93056..443d8bad840 100644
--- a/retrofit2/src/main/java/com/linecorp/armeria/client/retrofit2/ArmeriaRetrofitBuilder.java
+++ b/retrofit2/src/main/java/com/linecorp/armeria/client/retrofit2/ArmeriaRetrofitBuilder.java
@@ -216,8 +216,6 @@ public ArmeriaRetrofitBuilder validateEagerly(boolean validateEagerly) {
      * Returns a newly-created {@link Retrofit} based on the properties of this builder.
      */
     public Retrofit build() {
-        final SessionProtocol protocol = webClient.scheme().sessionProtocol();
-
         final ClientOptions retrofitOptions = buildOptions(webClient.options());
         // Re-create the base client without a path, because Retrofit will always provide a full path.
         final WebClient baseWebClient = WebClient.builder(webClient.executionFactory())