diff --git a/src/Builder/Reflection.php b/src/Builder/Reflection.php
index e4eb9d5..0a33831 100644
--- a/src/Builder/Reflection.php
+++ b/src/Builder/Reflection.php
@@ -63,6 +63,10 @@ private function collect(ReflectionMethod $constructor, array $data): iterable
             if ($parameter->isDefaultValueAvailable()) {
                 yield $parameter->getDefaultValue();
             }
+
+            if ($parameter->allowsNull()) {
+                yield null;
+            }
         }
     }
 
diff --git a/test/SimpleNullableConstructor.php b/test/SimpleNullableConstructor.php
new file mode 100644
index 0000000..c9b4416
--- /dev/null
+++ b/test/SimpleNullableConstructor.php
@@ -0,0 +1,17 @@
+<?php declare(strict_types=1);
+
+namespace RstGroup\ObjectBuilder\Test;
+
+class SimpleNullableConstructor
+{
+    public $someInt;
+    public $someString1;
+    public $someString2;
+
+    public function __construct(string $someString1, ?int $someInt, string $someString2)
+    {
+        $this->someInt = $someInt;
+        $this->someString1 = $someString1;
+        $this->someString2 = $someString2;
+    }
+}
diff --git a/test/unit/Builder/ReflectionTest.php b/test/unit/Builder/ReflectionTest.php
index 36f5bb9..53d90c9 100644
--- a/test/unit/Builder/ReflectionTest.php
+++ b/test/unit/Builder/ReflectionTest.php
@@ -14,6 +14,7 @@
 use RstGroup\ObjectBuilder\Test\Object\SomeSecondObject;
 use RstGroup\ObjectBuilder\Test\SimpleMixedConstructor;
 use RstGroup\ObjectBuilder\Test\SimpleMixedConstructorWithDefaultValue;
+use RstGroup\ObjectBuilder\Test\SimpleNullableConstructor;
 use RstGroup\ObjectBuilder\Test\SimpleScalarConstructor;
 use RstGroup\ObjectBuilder\Test\SomeAggregateRoot;
 use RstGroup\ObjectBuilder\Test\SomeObjectWithEmptyConstructor;
@@ -234,4 +235,22 @@ public function iCanBuildAdvancedObjectHierarchy()
         $this->assertSame(1, $object->simpleObject1->someInt);
         $this->assertSame(2, $object->simpleObject2->someInt);
     }
+
+    /** @test */
+    public function iCanBuildObjectWithNullableParameterWithoutDefaultValue()
+    {
+        $data = [
+            'someString1' => 'some string1',
+            'someString2' => 'some string2',
+        ];
+        $class = SimpleNullableConstructor::class;
+
+        /** @var SimpleNullableConstructor $object */
+        $object = static::$builder->build($class, $data);
+
+        $this->assertInstanceOf(SimpleNullableConstructor::class, $object);
+        $this->assertSame('some string1', $object->someString1);
+        $this->assertSame('some string2', $object->someString2);
+        $this->assertnull($object->someInt);
+    }
 }