diff --git a/src/js/dyna-rules.js b/src/js/dyna-rules.js
index f51bce22c..20ea3ec10 100644
--- a/src/js/dyna-rules.js
+++ b/src/js/dyna-rules.js
@@ -211,7 +211,7 @@ const rulesToDoc = function(clearHistory) {
             const mark = edit.markText(
                 { line: iline, ch: 0 },
                 { line: iline + 1, ch: 0 },
-                { readOnly: true }
+                { atomic: true, readOnly: true }
             );
             mark.uboEllipsis = true;
         }