diff --git a/src/function.ts b/src/function.ts
index 4ad9e9a..414ab2a 100644
--- a/src/function.ts
+++ b/src/function.ts
@@ -1,13 +1,10 @@
 import { truncate } from './helpers.js'
 import type { Options } from './types.js'
 
-export default function inspectFunction(func: Function, options: Options) {
-  let functionType = 'Function'
-  // @ts-ignore
-  const stringTag = func[Symbol.toStringTag];
-  if (typeof stringTag === 'string') {
-    functionType = stringTag;
-  }
+type ToStringable = Function & {[Symbol.toStringTag]: string};
+
+export default function inspectFunction(func: ToStringable, options: Options) {
+  const functionType = func[Symbol.toStringTag] || 'Function'
 
   const name = func.name
   if (!name) {
diff --git a/src/index.ts b/src/index.ts
index e5656cb..4b0c644 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -129,7 +129,7 @@ export function inspect(value: unknown, opts: Partial<Options> = {}): string {
   if (type === 'object') {
     type = toString.call(value).slice(8, -1)
   }
-  
+
   // If it is a base value that we already support, then use Loupe's inspector
   if (type in baseTypesMap) {
     return (baseTypesMap[type as keyof typeof baseTypesMap] as Inspect)(value, options)