diff --git a/lib/rules/attribute-hyphenation.js b/lib/rules/attribute-hyphenation.js
index 0ef2a0420..54ac77791 100644
--- a/lib/rules/attribute-hyphenation.js
+++ b/lib/rules/attribute-hyphenation.js
@@ -101,6 +101,10 @@ module.exports = {
             return null
           }
 
+          if (text.endsWith('.sync')) {
+            return null
+          }
+
           if (/^[A-Z]/.test(name)) {
             return null
           }
diff --git a/tests/lib/rules/attribute-hyphenation.js b/tests/lib/rules/attribute-hyphenation.js
index 4d867d15e..16f6e4e10 100644
--- a/tests/lib/rules/attribute-hyphenation.js
+++ b/tests/lib/rules/attribute-hyphenation.js
@@ -70,6 +70,16 @@ ruleTester.run('attribute-hyphenation', rule, {
       filename: 'test.vue',
       code: '<template><div><custom :attr_ff="prop"></custom></div></template>',
       options: ['never']
+    },
+    {
+      filename: 'test.vue',
+      code: '<template><div><custom :my-name.sync="prop"></custom></div></template>',
+      options: ['always']
+    },
+    {
+      filename: 'test.vue',
+      code: '<template><div><custom :myName.sync="prop"></custom></div></template>',
+      options: ['never']
     }
   ],
 
@@ -367,6 +377,32 @@ ruleTester.run('attribute-hyphenation', rule, {
           line: 1
         }
       ]
+    },
+    {
+      filename: 'test.vue',
+      code: '<template><div><custom :myAge.sync="prop"></custom></div></template>',
+      output: null,
+      options: ['always'],
+      errors: [
+        {
+          message: "Attribute ':myAge.sync' must be hyphenated.",
+          type: 'VDirectiveKey',
+          line: 1
+        }
+      ]
+    },
+    {
+      filename: 'test.vue',
+      code: '<template><div><custom :my-age.sync="prop"></custom></div></template>',
+      output: null,
+      options: ['never'],
+      errors: [
+        {
+          message: "Attribute ':my-age.sync' can't be hyphenated.",
+          type: 'VDirectiveKey',
+          line: 1
+        }
+      ]
     }
   ]
 })