diff --git a/src/Model/ParcelItem.php b/src/Model/ParcelItem.php
index e89e243..debd610 100644
--- a/src/Model/ParcelItem.php
+++ b/src/Model/ParcelItem.php
@@ -12,7 +12,7 @@ public static function fromData(array $data): self
         return new self(
             (string)$data['description'],
             (int)$data['quantity'],
-            round(((float)$data['weight']) * 1000),
+            (int)round(((float)$data['weight']) * 1000),
             (float)$data['value'],
             isset($data['hs_code']) ? (string)$data['hs_code'] : null,
             isset($data['origin_country']) ? (string)$data['origin_country'] : null,
diff --git a/src/Model/ShippingMethod.php b/src/Model/ShippingMethod.php
index 8bb3ba7..fd2d39b 100644
--- a/src/Model/ShippingMethod.php
+++ b/src/Model/ShippingMethod.php
@@ -14,8 +14,8 @@ public static function fromData(array $data): self
         return new self(
             (int)$data['id'],
             (string)$data['name'],
-            (int)($data['min_weight'] * 1000),
-            (int)($data['max_weight'] * 1000),
+            (int)round($data['min_weight'] * 1000.0),
+            (int)round($data['max_weight'] * 1000.0),
             (string)$data['carrier'],
             $prices,
             $data['service_point_input'] !== 'none',
diff --git a/test/ClientTest.php b/test/ClientTest.php
index e24a1eb..23954aa 100644
--- a/test/ClientTest.php
+++ b/test/ClientTest.php
@@ -69,7 +69,7 @@ public function testGetShippingMethods(): void
             return new Response(
                 200,
                 [],
-                '{"shipping_methods": [{"service_point_input": "none","max_weight": "1.000","name": "Low weight shipment","carrier": "carrier_code","countries": [{"iso_2": "BE","iso_3": "BEL","id": 1,"price": 3.50,"name": "Belgium"},{"iso_2": "NL","iso_3": "NLD","id": 2,"price": 4.20,"name": "Netherlands"}],"min_weight": "0.001","id": 1,"price": 0}]}'
+                '{"shipping_methods": [{"service_point_input": "none","min_weight": "0.001","max_weight": "1.001","name": "Low weight shipment","carrier": "carrier_code","countries": [{"iso_2": "BE","iso_3": "BEL","id": 1,"price": 3.50,"name": "Belgium"},{"iso_2": "NL","iso_3": "NLD","id": 2,"price": 4.20,"name": "Netherlands"}],"min_weight": "0.001","id": 1,"price": 0}]}'
             );
         });
 
@@ -78,7 +78,7 @@ public function testGetShippingMethods(): void
         $this->assertCount(1, $shippingMethods);
         $this->assertEquals(1, $shippingMethods[0]->getId());
         $this->assertEquals(1, $shippingMethods[0]->getMinimumWeight());
-        $this->assertEquals(1000, $shippingMethods[0]->getMaximumWeight());
+        $this->assertEquals(1001, $shippingMethods[0]->getMaximumWeight());
         $this->assertEquals('carrier_code', $shippingMethods[0]->getCarrier());
         $this->assertEquals(['BE' => 350, 'NL' => 420], $shippingMethods[0]->getPrices());
         $this->assertEquals(420, $shippingMethods[0]->getPriceForCountry('NL'));