diff --git a/.eslintrc.yml b/.eslintrc.yml
index cc4ed27..ef9fc3e 100644
--- a/.eslintrc.yml
+++ b/.eslintrc.yml
@@ -1,6 +1,7 @@
 env:
   node: true
 extends: 'eslint:recommended'
+root: true
 parserOptions:
   ecmaVersion: 5
 rules:
diff --git a/keywords/patch.js b/keywords/patch.js
index b992e1e..24093e7 100644
--- a/keywords/patch.js
+++ b/keywords/patch.js
@@ -15,7 +15,10 @@ module.exports = function(ajv) {
       },
       "anyOf": [
         {
-          "properties": { "op": { "enum": [ "add", "replace", "test" ] } },
+          "properties": {
+            "op": { "enum": [ "add", "replace", "test" ] },
+            "value": {},
+          },
           "required": [ "value" ]
         },
         {