diff --git a/src/js/code-viewer.js b/src/js/code-viewer.js
index 83d5de98a..e6cd1c01f 100644
--- a/src/js/code-viewer.js
+++ b/src/js/code-viewer.js
@@ -35,6 +35,7 @@ const cmEditor = new CodeMirror(qs$('#content'), {
     gutters: [ 'CodeMirror-linenumbers' ],
     lineNumbers: true,
     lineWrapping: true,
+    maximizable: false,
     matchBrackets: true,
     styleActiveLine: {
         nonEmpty: true,