diff --git a/src/services/textChanges.ts b/src/services/textChanges.ts
index 5c345e6e4e4..5b9f0f5ef4d 100644
--- a/src/services/textChanges.ts
+++ b/src/services/textChanges.ts
@@ -380,7 +380,7 @@ namespace ts.textChanges {
             return visited;
         }
         // clone nodearray if necessary
-        const nodeArray = visited === nodes ? createNodeArray(visited) : visited;
+        const nodeArray = visited === nodes ? createNodeArray(visited.slice(0)) : visited;
         nodeArray.pos = getPos(nodes);
         nodeArray.end = getEnd(nodes);
         return nodeArray;