diff --git a/templates/repo/wiki/new.tmpl b/templates/repo/wiki/new.tmpl
index 276ea54f3..002a36de9 100644
--- a/templates/repo/wiki/new.tmpl
+++ b/templates/repo/wiki/new.tmpl
@@ -21,7 +21,7 @@
 				<a class="item" data-tab="preview">{{.i18n.Tr "preview"}}</a>
 			</div>
 			<div class="field">
-				<textarea class="js-quick-submit" id="edit_area" name="content" data-id="wiki-{{.title}}" data-url="{{.Repository.APIURL}}/markdown" data-context="{{.RepoLink}}/wiki" required>{{if .PageIsWikiEdit}}{{.content}}{{else}}{{.i18n.Tr "repo.wiki.welcome"}}{{end}}</textarea>
+				<textarea class="js-quick-submit" id="edit_area" name="content" data-id="wiki-{{.title}}" data-url="{{.Repository.APIURL}}/markdown" data-context="{{.RepoLink}}" required>{{if .PageIsWikiEdit}}{{.content}}{{else}}{{.i18n.Tr "repo.wiki.welcome"}}{{end}}</textarea>
 			</div>
 			<div class="field">
 				<input name="message" placeholder="{{.i18n.Tr "repo.wiki.default_commit_message"}}">
diff --git a/web_src/js/index.js b/web_src/js/index.js
index 60ce8042c..c2f154911 100644
--- a/web_src/js/index.js
+++ b/web_src/js/index.js
@@ -1325,7 +1325,8 @@ function initWikiForm() {
               _csrf: csrf,
               mode: 'gfm',
               context: $editArea.data('context'),
-              text: plainText
+              text: plainText,
+              wiki: true
             }, (data) => {
               preview.innerHTML = `<div class="markdown ui segment">${data}</div>`;
               $(preview).find('pre code').each((_, e) => {