diff --git a/src/Price.php b/src/Price.php
index 1916992..2c5e2aa 100644
--- a/src/Price.php
+++ b/src/Price.php
@@ -238,17 +238,26 @@ public function jsonSerialize(): array
         $incl = $this->inclusive();
 
         return [
-            'base' => $this->base->toRational()->getAmount(),
+            'base' => $this->getRational($this->base)->getAmount(),
             'currency' => $this->base->getCurrency()->getCurrencyCode(),
             'units' => $this->units,
             'vat' => $this->vat->percentage(),
             'total' => [
-                'exclusive' => $excl->toRational()->getAmount(),
-                'inclusive' => $incl->toRational()->getAmount(),
+                'exclusive' => $this->getRational($excl)->getAmount(),
+                'inclusive' => $this->getRational($incl)->getAmount(),
             ],
         ];
     }
 
+    protected function getRational(AbstractMoney $money): RationalMoney
+    {
+        if(is_a($money, RationalMoney::class)) {
+            return $money;
+        }
+
+        return $money->toRational();
+    }
+
     /**
      * Hydrate a price object from a json string/array
      * @throws \InvalidArgumentException
diff --git a/tests/Unit/SerializesToJsonTest.php b/tests/Unit/SerializesToJsonTest.php
index 7e42e3d..3ae81a3 100644
--- a/tests/Unit/SerializesToJsonTest.php
+++ b/tests/Unit/SerializesToJsonTest.php
@@ -22,7 +22,7 @@
     expect($data['total']['inclusive'] ?? null)->toBe('1661/100');
 });
 
-it('hydrates instance from JSON string', function() {
+it('hydrates Money instance from JSON string', function() {
     $price = Price::ofMinor(500, 'EUR')
         ->setUnits(3)
         ->setVat(10.75);
@@ -35,6 +35,19 @@
     expect($instance->vat()->percentage())->toBe(10.75);
 });
 
+it('hydrates RationalMoney instance from JSON string', function() {
+    $price = (new Price(Money::ofMinor(500, 'EUR')->toRational()))
+        ->setUnits(3)
+        ->setVat(10.75);
+
+    $instance = Price::json(json_encode($price));
+
+    expect($instance)->toBeInstanceOf(Price::class);
+    expect($instance->getAmount()->compareTo($price->base()->getAmount()))->toBe(0);
+    expect($instance->units())->toBe(floatval(3));
+    expect($instance->vat()->percentage())->toBe(10.75);
+});
+
 it('hydrates instance from JSON array', function() {
     $data = [
         'base' => '500',