diff --git a/rules/no-negation-in-equality-check.js b/rules/no-negation-in-equality-check.js
index dd5df5aa57..170bdfcfbf 100644
--- a/rules/no-negation-in-equality-check.js
+++ b/rules/no-negation-in-equality-check.js
@@ -12,7 +12,7 @@ const {
 const MESSAGE_ID_ERROR = 'no-negation-in-equality-check/error';
 const MESSAGE_ID_SUGGESTION = 'no-negation-in-equality-check/suggestion';
 const messages = {
-	[MESSAGE_ID_ERROR]: 'Negated expression in not allowed in equality check.',
+	[MESSAGE_ID_ERROR]: 'Negated expression is not allowed in equality check.',
 	[MESSAGE_ID_SUGGESTION]: 'Switch to \'{{operator}}\' check.',
 };