diff --git a/lib/rules/id-match.js b/lib/rules/id-match.js
index dd8dbae55474..a7096e7d9975 100644
--- a/lib/rules/id-match.js
+++ b/lib/rules/id-match.js
@@ -67,6 +67,8 @@ module.exports = {
             onlyDeclarations = !!options.onlyDeclarations,
             ignoreDestructuring = !!options.ignoreDestructuring;
 
+        const globalScope = context.getScope();
+
         //--------------------------------------------------------------------------
         // Helpers
         //--------------------------------------------------------------------------
@@ -84,15 +86,14 @@ module.exports = {
          * @returns {boolean} `true` if the node is a reference to a global variable.
          */
         function isReferenceToGlobalVariable(node) {
-            const scope = context.getScope();
-            const variable = scope.set.get(node.name);
+            const variable = globalScope.set.get(node.name);
 
             return variable && variable.defs.length === 0 &&
                 variable.references.some(ref => ref.identifier === node);
         }
 
         /**
-         * Checks if a string matches the provided pattern and is not a global reference
+         * Checks if a string matches the provided pattern
          * @param {string} name The string to check.
          * @returns {boolean} if the string is a match
          * @private
@@ -267,10 +268,6 @@ module.exports = {
 
                 const isClassField = node.parent.type === "PropertyDefinition";
 
-                if (isReferenceToGlobalVariable(node)) {
-                    return;
-                }
-
                 if (isClassField && !checkClassFields) {
                     return;
                 }
diff --git a/tests/lib/rules/id-match.js b/tests/lib/rules/id-match.js
index 7afcd4c2e467..ccf7abfdf5b8 100644
--- a/tests/lib/rules/id-match.js
+++ b/tests/lib/rules/id-match.js
@@ -665,6 +665,8 @@ ruleTester.run("id-match", rule, {
             let e = (Object) => Object.keys(obj, prop); // not global Object
             let f = (Array) => Array.from(obj, prop); // not global Array
             foo.Array = 5; // not global Array
+
+            foo = () => Array; // global Array
             `,
             options: ["^\\$?[a-z]+([A-Z0-9][a-z0-9]+)*$", {
                 properties: true