diff --git a/Normalizer/AbstractNormalizer.php b/Normalizer/AbstractNormalizer.php
index a8854415..3cd4be83 100644
--- a/Normalizer/AbstractNormalizer.php
+++ b/Normalizer/AbstractNormalizer.php
@@ -399,10 +399,16 @@ protected function instantiateObject(array &$data, string $class, array &$contex
                         continue;
                     }
 
+                    $constructorParameterType = 'unknown';
+                    $reflectionType = $constructorParameter->getType();
+                    if ($reflectionType instanceof \ReflectionNamedType) {
+                        $constructorParameterType = $reflectionType->getName();
+                    }
+
                     $exception = NotNormalizableValueException::createForUnexpectedDataType(
                         sprintf('Failed to create object because the class misses the "%s" property.', $constructorParameter->name),
                         $data,
-                        ['unknown'],
+                        [$constructorParameterType],
                         $attributeContext['deserialization_path'] ?? null,
                         true
                     );
diff --git a/Tests/SerializerTest.php b/Tests/SerializerTest.php
index 90a99374..165194c4 100644
--- a/Tests/SerializerTest.php
+++ b/Tests/SerializerTest.php
@@ -1309,7 +1309,7 @@ public function testCollectDenormalizationErrorsWithConstructor(?ClassMetadataFa
             [
                 'currentType' => 'array',
                 'expectedTypes' => [
-                    'unknown',
+                    'string',
                 ],
                 'path' => 'string',
                 'useMessageForUser' => true,
@@ -1318,7 +1318,7 @@ public function testCollectDenormalizationErrorsWithConstructor(?ClassMetadataFa
             [
                 'currentType' => 'array',
                 'expectedTypes' => [
-                    'unknown',
+                    'int',
                 ],
                 'path' => 'int',
                 'useMessageForUser' => true,
@@ -1627,7 +1627,7 @@ public function testPartialDenormalizationWithMissingConstructorTypes()
             [
                 'currentType' => 'array',
                 'expectedTypes' => [
-                    'unknown',
+                    'string',
                 ],
                 'path' => 'two',
                 'useMessageForUser' => true,