diff --git a/lib/progress.ts b/lib/progress.ts
index 0e1afd1..3fee9d6 100644
--- a/lib/progress.ts
+++ b/lib/progress.ts
@@ -93,16 +93,12 @@ export interface BalenaRequestPassThroughStream extends Stream.PassThrough {
  * 			console.log(state)
  */
 export function estimate(
-	requestAsync?: ReturnType<typeof getRequestAsync>,
+	requestAsync: ReturnType<typeof getRequestAsync> = utils.getRequestAsync(),
 	isBrowser?: boolean,
 ) {
 	return async function (
 		options: BalenaRequestOptions,
 	): Promise<BalenaRequestPassThroughStream> {
-		if (requestAsync == null) {
-			requestAsync = utils.getRequestAsync();
-		}
-
 		options.gzip = false;
 		options.headers!['Accept-Encoding'] = 'gzip, deflate';
 
diff --git a/lib/utils.ts b/lib/utils.ts
index 781c395..c6c042e 100644
--- a/lib/utils.ts
+++ b/lib/utils.ts
@@ -262,11 +262,9 @@ const processRequestOptions = function (options: BalenaRequestOptions) {
 		url += (url.indexOf('?') >= 0 ? '&' : '?') + params;
 	}
 
-	let { body, headers } = options;
-	if (headers == null) {
-		headers = {} as Record<string, string>;
-	}
-	if (options.json && body) {
+	let { body } = options;
+	const { headers = {}, json } = options;
+	if (json && body) {
 		body = JSON.stringify(body);
 		headers['Content-Type'] = 'application/json';
 	}