diff --git a/acorn-walk/src/index.js b/acorn-walk/src/index.js
index 924939a67..1f5ce4b14 100644
--- a/acorn-walk/src/index.js
+++ b/acorn-walk/src/index.js
@@ -73,7 +73,7 @@ export function full(node, callback, baseVisitor, state, override) {
   ;(function c(node, st, override) {
     let type = override || node.type
     baseVisitor[type](node, st, c)
-    if (last != node) {
+    if (last !== node) {
       callback(node, st, type)
       last = node
     }
@@ -90,7 +90,7 @@ export function fullAncestor(node, callback, baseVisitor, state) {
     let isNew = node !== ancestors[ancestors.length - 1]
     if (isNew) ancestors.push(node)
     baseVisitor[type](node, st, c)
-    if (last != node) {
+    if (last !== node) {
       callback(node, st || ancestors, ancestors, type)
       last = node
     }