diff --git a/Internal/Code/PhpType.php b/Internal/Code/PhpType.php
index 58030cf..ed67d5b 100644
--- a/Internal/Code/PhpType.php
+++ b/Internal/Code/PhpType.php
@@ -62,7 +62,7 @@ public function toPhpDoc(string $paramName): string
      */
     public static function scalar(string $nativeType, ?string $phpDocType = null, null|bool|string|int $default = null): self
     {
-        return new self($nativeType, $phpDocType, default: $default);
+        return new self($nativeType, $phpDocType, nullable: null === $default, default: $default);
     }
 
     /**
diff --git a/Internal/Code/Type/ScalarTypeVisitor.php b/Internal/Code/Type/ScalarTypeVisitor.php
index ba2e0ae..869f306 100644
--- a/Internal/Code/Type/ScalarTypeVisitor.php
+++ b/Internal/Code/Type/ScalarTypeVisitor.php
@@ -44,12 +44,12 @@ final class ScalarTypeVisitor extends DefaultTypeVisitor
     public function scalar(ProtoType $type, Scalar $scalar): PhpType
     {
         return match ($scalar) {
-            Scalar::bool   => PhpType::scalar('bool', default: false),
-            Scalar::string => PhpType::scalar('string', default: ''),
-            Scalar::bytes  => PhpType::scalar('string', 'bytes', ''),
-            Scalar::double => PhpType::scalar('float', 'double', 0),
-            Scalar::float  => PhpType::scalar('float', default: 0),
-            default        => PhpType::scalar('int', $scalar->value, 0),
+            Scalar::bool   => PhpType::scalar('bool'),
+            Scalar::string => PhpType::scalar('string'),
+            Scalar::bytes  => PhpType::scalar('string', 'bytes'),
+            Scalar::double => PhpType::scalar('float', 'double'),
+            Scalar::float  => PhpType::scalar('float'),
+            default        => PhpType::scalar('int', $scalar->value),
         };
     }
 }