diff --git a/edit/source-editor.js b/edit/source-editor.js
index 77e4e478..49299bc7 100644
--- a/edit/source-editor.js
+++ b/edit/source-editor.js
@@ -19,6 +19,8 @@ function createSourceEditor(style) {
   // draw CodeMirror
   $('#sections textarea').value = style.source;
   const cm = CodeMirror.fromTextArea($('#sections textarea'));
+  // too many functions depend on this global
+  editors.push(cm);
 
   // dirty reporter
   const dirty = dirtyReporter();