diff --git a/packages/better-php-doc-parser/src/PhpDocNode/Doctrine/Property_/ColumnTagValueNode.php b/packages/better-php-doc-parser/src/PhpDocNode/Doctrine/Property_/ColumnTagValueNode.php
index ed1891351492..a7a026222f8d 100644
--- a/packages/better-php-doc-parser/src/PhpDocNode/Doctrine/Property_/ColumnTagValueNode.php
+++ b/packages/better-php-doc-parser/src/PhpDocNode/Doctrine/Property_/ColumnTagValueNode.php
@@ -4,6 +4,7 @@
 
 namespace Rector\BetterPhpDocParser\PhpDocNode\Doctrine\Property_;
 
+use Nette\Utils\Strings;
 use Rector\BetterPhpDocParser\PhpDocNode\Doctrine\AbstractDoctrineTagValueNode;
 
 final class ColumnTagValueNode extends AbstractDoctrineTagValueNode
@@ -58,6 +59,11 @@ final class ColumnTagValueNode extends AbstractDoctrineTagValueNode
      */
     private $options;
 
+    /**
+     * @var bool
+     */
+    private $isNullableUppercase = false;
+
     /**
      * @param mixed[] $options
      * @param mixed|null $length
@@ -86,6 +92,11 @@ public function __construct(
 
         if ($originalContent !== null) {
             $this->resolveOriginalContentSpacingAndOrder($originalContent);
+
+            $matchIsNullable = Strings::match($originalContent, '#nullable(\s+)?=(\s+)?(?<value>false|true)#si');
+            if ($matchIsNullable) {
+                $this->isNullableUppercase = ctype_upper($matchIsNullable['value']);
+            }
         }
     }
 
@@ -126,7 +137,12 @@ public function __toString(): string
         }
 
         if ($this->nullable !== null) {
-            $contentItems['nullable'] = sprintf('nullable=%s', $this->nullable ? 'true' : 'false');
+            $nullableValue = $this->nullable ? 'true' : 'false';
+            if ($this->isNullableUppercase) {
+                $nullableValue = strtoupper($nullableValue);
+            }
+
+            $contentItems['nullable'] = sprintf('nullable=%s', $nullableValue);
         }
 
         return $this->printContentItems($contentItems);
diff --git a/src/PhpParser/Printer/BetterStandardPrinter.php b/src/PhpParser/Printer/BetterStandardPrinter.php
index f2ee7167d014..0ad420a4bfb7 100644
--- a/src/PhpParser/Printer/BetterStandardPrinter.php
+++ b/src/PhpParser/Printer/BetterStandardPrinter.php
@@ -362,12 +362,9 @@ private function detectTabOrSpaceIndentCharacter(array $stmts): void
                 continue;
             }
 
-            $whitespacesChars = Strings::matchAll($fileInfo->getContents(), '#^( |\t)#m');
-            foreach ($whitespacesChars as $whitespacesChar) {
-                // let the first win
-                $this->tabOrSpaceIndentCharacter = $whitespacesChar[0];
-                break;
-            }
+            // tab vs space
+            $tabIndentChars = Strings::match($fileInfo->getContents(), '#^\t#m');
+            $this->tabOrSpaceIndentCharacter = $tabIndentChars[0] ?? ' ';
         }
     }