diff --git a/src/jira.js b/src/jira.js
index 60e0bb80..5640d33b 100644
--- a/src/jira.js
+++ b/src/jira.js
@@ -992,11 +992,17 @@ export default class JiraApi {
    * @param {object} worklog - worklog object from the rest API
    * @param {object} newEstimate - the new value for the remaining estimate field
    */
-  addWorklog(issueId, worklog, newEstimate) {
+  addWorklog(issueId, worklog, newEstimate = null) {
+    const query = { adjustEstimate: 'auto' };
+    if (newEstimate) {
+      query.adjustEstimate = 'new';
+      query.newEstimate = newEstimate;
+    }
+
     const header = {
       uri: this.makeUri({
         pathname: `/issue/${issueId}/worklog`,
-        query: { adjustEstimate: 'new', newEstimate },
+        query,
       }),
       body: worklog,
       method: 'POST',