diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5d1553d0..7483ac3a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -22,6 +22,7 @@ and this project adheres to [Semantic Versioning](https://semver.org).
 - Change `libxml_disable_entity_loader()` as shortly as possible - [#819](https://github.com/PHPOffice/PhpSpreadsheet/pull/819)
 - Improved memory usage and performance when loading large spreadsheets - [#822](https://github.com/PHPOffice/PhpSpreadsheet/pull/822)
 - Improved performance when loading large spreadsheets - [#825](https://github.com/PHPOffice/PhpSpreadsheet/pull/825)
+- Improved performance when loading large spreadsheets - [#824](https://github.com/PHPOffice/PhpSpreadsheet/pull/824)
 
 ## [1.5.2] - 2018-11-25
 
diff --git a/src/PhpSpreadsheet/Worksheet/Worksheet.php b/src/PhpSpreadsheet/Worksheet/Worksheet.php
index dd233901..d0224037 100644
--- a/src/PhpSpreadsheet/Worksheet/Worksheet.php
+++ b/src/PhpSpreadsheet/Worksheet/Worksheet.php
@@ -1268,7 +1268,9 @@ class Worksheet implements IComparable
         if (Coordinate::columnIndexFromString($this->cachedHighestColumn) < Coordinate::columnIndexFromString($aCoordinates[0])) {
             $this->cachedHighestColumn = $aCoordinates[0];
         }
-        $this->cachedHighestRow = max($this->cachedHighestRow, $aCoordinates[1]);
+        if ($aCoordinates[1] > $this->cachedHighestRow) {
+            $this->cachedHighestRow = $aCoordinates[1];
+        }
 
         // Cell needs appropriate xfIndex from dimensions records
         //    but don't create dimension records if they don't already exist