diff --git a/src/core/render/compiler.js b/src/core/render/compiler.js
index aad4db907b..fc140f193a 100644
--- a/src/core/render/compiler.js
+++ b/src/core/render/compiler.js
@@ -191,11 +191,12 @@ export class Compiler {
     const currentPath = this.router.getCurrentPath()
     const { cacheTree, toc } = this
 
-    toc[0] && toc[0].ignoreAllSubs && toc.splice(0, toc.length)
+    toc[0] && toc[0].ignoreAllSubs && toc.splice(0)
     toc[0] && toc[0].level === 1 && toc.shift()
-    toc.forEach((node, i) => {
-      node.ignoreSubHeading && toc.splice(i, 1)
-    })
+
+    for (let i = 0; i < toc.length; i++) {
+      toc[i].ignoreSubHeading && toc.splice(i, 1) && i--
+    }
 
     const tree = cacheTree[currentPath] || genTree(toc, level)