diff --git a/src/Validations/primitives/bigint.ts b/src/Validations/primitives/bigint.ts
index ab93693..476b064 100644
--- a/src/Validations/primitives/bigint.ts
+++ b/src/Validations/primitives/bigint.ts
@@ -25,15 +25,15 @@ export const bigint: SyncValidation = {
     }
 
     /**
-     * Report error when value is not a bigint and neither a string
+     * Report error when value is not a bigint and neither a string or a number
      */
-    if (typeof value !== 'string') {
+    if (typeof value !== 'string' && typeof value !== 'number') {
       errorReporter.report(pointer, RULE_NAME, DEFAULT_MESSAGE, arrayExpressionPointer)
       return
     }
 
     /**
-     * Attempt to cast bigint like string to a bigint. In case of
+     * Attempt to cast string or number to a bigint. In case of
      * failure report the validation error
      */
     try {
diff --git a/test/validations/bigint.spec.ts b/test/validations/bigint.spec.ts
index 6837d4d..22ffac3 100644
--- a/test/validations/bigint.spec.ts
+++ b/test/validations/bigint.spec.ts
@@ -120,4 +120,24 @@ test.group('BigInt', () => {
       ],
     })
   })
+
+  test('cast number to a valid bigint', ({ assert }) => {
+    const reporter = new ApiErrorReporter(new MessagesBag({}), false)
+    let value: any = 21
+
+    bigint.validate(value, compile().compiledOptions, {
+      errorReporter: reporter,
+      field: 'age',
+      pointer: 'age',
+      tip: {},
+      root: {},
+      refs: {},
+      mutate: (newValue) => {
+        value = newValue
+      },
+    })
+
+    assert.deepEqual(reporter.toJSON(), { errors: [] })
+    assert.equal(value, 21n)
+  })
 })