diff --git a/source/index.ts b/source/index.ts
index 4ee63f1..93ddfee 100644
--- a/source/index.ts
+++ b/source/index.ts
@@ -48,7 +48,7 @@ const objectTypeNames = [
 	'FormData',
 	'URLSearchParams',
 	'HTMLElement',
-	...typedArrayTypeNames,
+	'NaN',
 ] as const;
 
 type ObjectTypeName = typeof objectTypeNames[number];
@@ -108,7 +108,7 @@ function is(value: unknown): TypeName {
 		case 'string':
 			return 'string';
 		case 'number':
-			return 'number';
+			return Number.isNaN(value) ? 'NaN' : 'number';
 		case 'boolean':
 			return 'boolean';
 		case 'function':
diff --git a/test/test.ts b/test/test.ts
index b99a86e..8017559 100644
--- a/test/test.ts
+++ b/test/test.ts
@@ -455,8 +455,8 @@ const types = new Map<string, Test>([
 			NaN, // eslint-disable-line unicorn/prefer-number-properties
 			Number.NaN,
 		],
-		typename: 'number',
-		typeDescription: AssertionTypeDescription.nan,
+		typename: 'NaN',
+		typeDescription: AssertionTypeDescription.nan
 	}],
 	['nullOrUndefined', {
 		is: is.nullOrUndefined,