diff --git a/lib/rules/radix.js b/lib/rules/radix.js
index 2174e7d0339..d1503dba1a4 100644
--- a/lib/rules/radix.js
+++ b/lib/rules/radix.js
@@ -144,7 +144,7 @@ module.exports = {
 
                 // Check `parseInt()`
                 variable = astUtils.getVariableByName(scope, "parseInt");
-                if (!isShadowed(variable)) {
+                if (variable && !isShadowed(variable)) {
                     variable.references.forEach(reference => {
                         const node = reference.identifier;
 
@@ -156,7 +156,7 @@ module.exports = {
 
                 // Check `Number.parseInt()`
                 variable = astUtils.getVariableByName(scope, "Number");
-                if (!isShadowed(variable)) {
+                if (variable && !isShadowed(variable)) {
                     variable.references.forEach(reference => {
                         const node = reference.identifier.parent;
 
diff --git a/tests/lib/rules/radix.js b/tests/lib/rules/radix.js
index 5e27c9c135b..6c0bed80a19 100644
--- a/tests/lib/rules/radix.js
+++ b/tests/lib/rules/radix.js
@@ -45,13 +45,15 @@ ruleTester.run("radix", rule, {
         "Number.foo();",
         "Number[parseInt]();",
 
-        // Ignores if it's shadowed.
+        // Ignores if it's shadowed or disabled.
         "var parseInt; parseInt();",
         { code: "var parseInt; parseInt(foo);", options: ["always"] },
         { code: "var parseInt; parseInt(foo, 10);", options: ["as-needed"] },
         "var Number; Number.parseInt();",
         { code: "var Number; Number.parseInt(foo);", options: ["always"] },
-        { code: "var Number; Number.parseInt(foo, 10);", options: ["as-needed"] }
+        { code: "var Number; Number.parseInt(foo, 10);", options: ["as-needed"] },
+        { code: "/* globals parseInt:off */ parseInt(foo);", options: ["always"] },
+        { code: "Number.parseInt(foo, 10);", options: ["as-needed"], globals: { Number: "off" } }
     ],
 
     invalid: [