diff --git a/library/src/main/java/com/readystatesoftware/chuck/internal/support/JsonConvertor.java b/library/src/main/java/com/readystatesoftware/chuck/internal/support/JsonConvertor.java
index 0d0e3b03..db220840 100644
--- a/library/src/main/java/com/readystatesoftware/chuck/internal/support/JsonConvertor.java
+++ b/library/src/main/java/com/readystatesoftware/chuck/internal/support/JsonConvertor.java
@@ -31,12 +31,19 @@ private JsonConvertor() {
 
     public static Gson getInstance() {
         if (gson == null) {
-            gson = new GsonBuilder()
-                    .setPrettyPrinting()
-                    .setFieldNamingPolicy(FieldNamingPolicy.LOWER_CASE_WITH_UNDERSCORES)
-                    .registerTypeAdapter(Date.class, new DateTypeAdapter())
-                    .create();
+            gson = getDefaultGsonBuilder().create();
         }
         return gson;
     }
+
+    public static void setInstance(Gson gson) {
+        JsonConvertor.gson = gson;
+    }
+
+    public static GsonBuilder getDefaultGsonBuilder() {
+        return new GsonBuilder()
+                .setPrettyPrinting()
+                .setFieldNamingPolicy(FieldNamingPolicy.LOWER_CASE_WITH_UNDERSCORES)
+                .registerTypeAdapter(Date.class, new DateTypeAdapter());
+    }
 }
diff --git a/sample/src/main/java/com/readystatesoftware/chuck/sample/MainActivity.java b/sample/src/main/java/com/readystatesoftware/chuck/sample/MainActivity.java
index d56c231f..136287cb 100644
--- a/sample/src/main/java/com/readystatesoftware/chuck/sample/MainActivity.java
+++ b/sample/src/main/java/com/readystatesoftware/chuck/sample/MainActivity.java
@@ -17,13 +17,14 @@
 
 import android.content.Context;
 import android.os.Bundle;
+import android.support.annotation.NonNull;
 import android.support.annotation.Nullable;
 import android.support.v7.app.AppCompatActivity;
 import android.view.View;
-
+import com.google.gson.Gson;
 import com.readystatesoftware.chuck.Chuck;
 import com.readystatesoftware.chuck.ChuckInterceptor;
-
+import com.readystatesoftware.chuck.internal.support.JsonConvertor;
 import okhttp3.OkHttpClient;
 import okhttp3.logging.HttpLoggingInterceptor;
 import retrofit2.Call;
@@ -53,11 +54,20 @@ public void onClick(View view) {
     private OkHttpClient getClient(Context context) {
         return new OkHttpClient.Builder()
                 // Add a ChuckInterceptor instance to your OkHttp client
-                .addInterceptor(new ChuckInterceptor(context))
+                .addInterceptor(createChuckInterceptor(context))
                 .addInterceptor(new HttpLoggingInterceptor().setLevel(HttpLoggingInterceptor.Level.BODY))
                 .build();
     }
 
+    @NonNull
+    private ChuckInterceptor createChuckInterceptor(Context context) {
+        Gson gson = JsonConvertor.getDefaultGsonBuilder()
+                .serializeNulls()
+                .create();
+        JsonConvertor.setInstance(gson);
+        return new ChuckInterceptor(context);
+    }
+
     private void launchChuckDirectly() {
         // Optionally launch Chuck directly from your own app UI
         startActivity(Chuck.getLaunchIntent(this));