diff --git a/src/compiler/error-detector.js b/src/compiler/error-detector.js
index 05df8b27d54..778becad8b8 100644
--- a/src/compiler/error-detector.js
+++ b/src/compiler/error-detector.js
@@ -59,7 +59,7 @@ function checkNode (node: ASTNode, warn: Function) {
 function checkEvent (exp: string, text: string, warn: Function, range?: Range) {
   const stripped = exp.replace(stripStringRE, '')
   const keywordMatch: any = stripped.match(unaryOperatorsRE)
-  if (keywordMatch && stripped.charAt(keywordMatch.index - 1) !== '$') {
+  if (keywordMatch && !['$', '.'].includes(stripped.charAt(keywordMatch.index - 1))) {
     warn(
       `avoid using JavaScript unary operator as property name: ` +
       `"${keywordMatch[0]}" in expression ${text.trim()}`,
diff --git a/test/unit/features/options/template.spec.js b/test/unit/features/options/template.spec.js
index 09aafd3efaa..99019f9b7db 100644
--- a/test/unit/features/options/template.spec.js
+++ b/test/unit/features/options/template.spec.js
@@ -88,4 +88,13 @@ describe('Options template', () => {
       `avoid using JavaScript unary operator as property name: "delete()" in expression @click="delete('Delete')"`
     ).toHaveBeenWarned()
   })
+
+  it('warn error in generated function (v-on)', () => {
+    Vue.prototype.$http = { delete: () => {} };
+    new Vue({
+      template: `<div @click="$http.delete('/endpoint')"></div>`
+    }).$mount();
+    expect("Error compiling template").not.toHaveBeenWarned();
+    delete Vue.prototype.$http;
+  })
 })