diff --git a/src/decorator/typechecker/IsObject.ts b/src/decorator/typechecker/IsObject.ts
index 5cbd415b67..882c012313 100644
--- a/src/decorator/typechecker/IsObject.ts
+++ b/src/decorator/typechecker/IsObject.ts
@@ -8,7 +8,7 @@ export const IS_OBJECT = 'isObject';
  * Returns false if the value is not an object.
  */
 export function isObject<T = object>(value: unknown): value is T {
-  return value != null && (typeof value === 'object' || typeof value === 'function') && !Array.isArray(value);
+  return value != null && typeof value === 'object' && !Array.isArray(value);
 }
 
 /**
diff --git a/test/functional/validation-functions-and-decorators.spec.ts b/test/functional/validation-functions-and-decorators.spec.ts
index 4c266f02ee..97f2197cbb 100644
--- a/test/functional/validation-functions-and-decorators.spec.ts
+++ b/test/functional/validation-functions-and-decorators.spec.ts
@@ -3166,6 +3166,10 @@ describe('IsObject', () => {
     '[]',
     [],
     [{ key: 'value' }],
+    () => 'function',
+    function namedFn() {
+      return 'named function';
+    },
   ];
 
   class MyClass {