diff --git a/retrofit-mock/src/main/java/retrofit/MockRestAdapter.java b/retrofit-mock/src/main/java/retrofit/MockRestAdapter.java
index 25c02dac55..7fd68b2657 100644
--- a/retrofit-mock/src/main/java/retrofit/MockRestAdapter.java
+++ b/retrofit-mock/src/main/java/retrofit/MockRestAdapter.java
@@ -267,8 +267,8 @@ private Request buildRequest(RestMethodInfo methodInfo, RequestInterceptor inter
       methodInfo.init();
 
       // Begin building a normal request.
-      RequestBuilder requestBuilder = new RequestBuilder(restAdapter.converter, methodInfo);
-      requestBuilder.setApiUrl(restAdapter.server.getUrl());
+      String apiUrl = restAdapter.server.getUrl();
+      RequestBuilder requestBuilder = new RequestBuilder(apiUrl, methodInfo, restAdapter.converter);
       requestBuilder.setArguments(args);
 
       // Run it through the interceptor.
diff --git a/retrofit/src/main/java/retrofit/RequestBuilder.java b/retrofit/src/main/java/retrofit/RequestBuilder.java
index 5525b9a8f5..725094aa2a 100644
--- a/retrofit/src/main/java/retrofit/RequestBuilder.java
+++ b/retrofit/src/main/java/retrofit/RequestBuilder.java
@@ -39,17 +39,18 @@ final class RequestBuilder implements RequestInterceptor.RequestFacade {
   private final String requestMethod;
   private final boolean isSynchronous;
   private final boolean isObservable;
+  private final String apiUrl;
 
   private final FormUrlEncodedTypedOutput formBody;
   private final MultipartTypedOutput multipartBody;
   private TypedOutput body;
 
-  private String apiUrl;
   private String relativeUrl;
   private StringBuilder queryParams;
   private List<Header> headers;
 
-  RequestBuilder(Converter converter, RestMethodInfo methodInfo) {
+  RequestBuilder(String apiUrl, RestMethodInfo methodInfo, Converter converter) {
+    this.apiUrl = apiUrl;
     this.converter = converter;
 
     paramNames = methodInfo.requestParamNames;
@@ -90,10 +91,6 @@ final class RequestBuilder implements RequestInterceptor.RequestFacade {
     }
   }
 
-  void setApiUrl(String apiUrl) {
-    this.apiUrl = apiUrl;
-  }
-
   @Override public void addHeader(String name, String value) {
     if (name == null) {
       throw new IllegalArgumentException("Header name must not be null.");
diff --git a/retrofit/src/main/java/retrofit/RestAdapter.java b/retrofit/src/main/java/retrofit/RestAdapter.java
index 0739651ba3..8a8e6b01a0 100644
--- a/retrofit/src/main/java/retrofit/RestAdapter.java
+++ b/retrofit/src/main/java/retrofit/RestAdapter.java
@@ -329,8 +329,7 @@ private Object invokeRequest(RequestInterceptor requestInterceptor,
       String serverUrl = server.getUrl();
       String url = serverUrl; // Keep some url in case RequestBuilder throws an exception.
       try {
-        RequestBuilder requestBuilder = new RequestBuilder(converter, methodInfo);
-        requestBuilder.setApiUrl(serverUrl);
+        RequestBuilder requestBuilder = new RequestBuilder(serverUrl, methodInfo, converter);
         requestBuilder.setArguments(args);
 
         requestInterceptor.intercept(requestBuilder);
diff --git a/retrofit/src/test/java/retrofit/RequestBuilderTest.java b/retrofit/src/test/java/retrofit/RequestBuilderTest.java
index 525024456f..850a8b3014 100644
--- a/retrofit/src/test/java/retrofit/RequestBuilderTest.java
+++ b/retrofit/src/test/java/retrofit/RequestBuilderTest.java
@@ -890,7 +890,7 @@ Request build() throws Exception {
       methodInfo.headers = headers;
       methodInfo.loaded = true;
 
-      RequestBuilder requestBuilder = new RequestBuilder(GSON, methodInfo);
+      RequestBuilder requestBuilder = new RequestBuilder(url, methodInfo, GSON);
 
       // Simulate request interceptor invocation.
       for (Header header : interceptorHeaders) {
@@ -903,7 +903,6 @@ Request build() throws Exception {
         requestBuilder.addQueryParam(entry.getKey(), entry.getValue());
       }
 
-      requestBuilder.setApiUrl(url);
       requestBuilder.setArguments(args.toArray(new Object[args.size()]));
 
       return requestBuilder.build();