diff --git a/lib/rule-tester/rule-tester.js b/lib/rule-tester/rule-tester.js
index 0491e4f653ee..9f5576fa4524 100644
--- a/lib/rule-tester/rule-tester.js
+++ b/lib/rule-tester/rule-tester.js
@@ -645,7 +645,7 @@ class RuleTester {
                 `Did not specify errors for an invalid test of ${ruleName}`);
 
             if (Array.isArray(item.errors) && item.errors.length === 0) {
-                assert.fail("errors array should have atleast one element otherwise its a valid case");
+                assert.fail("errors array should have at least one element otherwise its a valid case");
             }
 
             const ruleHasMetaMessages = hasOwnProperty(rule, "meta") && hasOwnProperty(rule.meta, "messages");