diff --git a/index.js b/index.js
index 77f7907..d3fa7dc 100644
--- a/index.js
+++ b/index.js
@@ -2,24 +2,23 @@ module.exports = (nextConfig = {}) => {
   return Object.assign({}, nextConfig, {
     webpack(config, options) {
       const { isServer } = options;
+      nextConfig = Object.assign({ inlineImageLimit: 8192, assetPrefix: "" }, nextConfig);
+
       if (!options.defaultLoaders) {
         throw new Error(
           'This plugin is not compatible with Next.js versions below 5.0.0 https://err.sh/next-plugins/upgrade'
         )
       }
 
-      const assetPrefix = nextConfig.assetPrefix || "";
-      const limit = nextConfig.inlineImageLimit || 8192;
-
       config.module.rules.push({
         test: /\.(jpe?g|png|svg|gif|ico)$/,
         use: [
           {
             loader: "url-loader",
             options: {
-              limit,
+              limit: nextConfig.inlineImageLimit,
               fallback: "file-loader",
-              publicPath: `${assetPrefix}/_next/static/images/`,
+              publicPath: `${nextConfig.assetPrefix}/_next/static/images/`,
               outputPath: `${isServer ? "../" : ""}static/images/`,
               name: "[name]-[hash].[ext]"
             }