diff --git a/.php_cs.dist b/.php_cs.dist
index 04bf320..4fae2e0 100644
--- a/.php_cs.dist
+++ b/.php_cs.dist
@@ -12,6 +12,7 @@ $config = PhpCsFixer\Config::create()
         'concat_space' => ['spacing' => 'one'],
         'declare_equal_normalize' => ['space' => 'single'],
         'heredoc_to_nowdoc' => true,
+        'increment_style' => ['style' => 'post'],
         'is_null' => ['use_yoda_style' => false],
         'method_argument_space' => ['ensure_fully_multiline' => true],
         'modernize_types_casting' => true,
@@ -34,7 +35,6 @@ $config = PhpCsFixer\Config::create()
         'phpdoc_summary' => false,
         'phpdoc_types_order' => ['null_adjustment' => 'always_last', 'sort_algorithm' => 'none'],
         'phpdoc_separation' => false,
-        'pre_increment' => false,
         'protected_to_private' => true,
         'psr4' => true,
         'return_type_declaration' => ['space_before' => 'one'],
diff --git a/src/Spout/Reader/XLSX/Helper/CellValueFormatter.php b/src/Spout/Reader/XLSX/Helper/CellValueFormatter.php
index aaebfa6..458765e 100644
--- a/src/Spout/Reader/XLSX/Helper/CellValueFormatter.php
+++ b/src/Spout/Reader/XLSX/Helper/CellValueFormatter.php
@@ -200,7 +200,7 @@ class CellValueFormatter
     {
         // Fix for the erroneous leap year in Excel
         if (ceil($nodeValue) > self::ERRONEOUS_EXCEL_LEAP_YEAR_DAY) {
-            --$nodeValue;
+            $nodeValue--;
         }
 
         if ($nodeValue >= 1) {