diff --git a/src/PhpSpreadsheet/Writer/Xlsx/Worksheet.php b/src/PhpSpreadsheet/Writer/Xlsx/Worksheet.php
index 83238d7a3..2c8e6f58c 100644
--- a/src/PhpSpreadsheet/Writer/Xlsx/Worksheet.php
+++ b/src/PhpSpreadsheet/Writer/Xlsx/Worksheet.php
@@ -635,10 +635,10 @@ class Worksheet extends WriterPart
                     self::writeAttributeif(
                         $objWriter,
                         (
-                            $conditional->getConditionType() == Conditional::CONDITION_CELLIS
-                            || $conditional->getConditionType() == Conditional::CONDITION_CONTAINSTEXT
-                            || $conditional->getConditionType() == Conditional::CONDITION_NOTCONTAINSTEXT
-                        ) && $conditional->getOperatorType() != Conditional::OPERATOR_NONE,
+                            $conditional->getConditionType() === Conditional::CONDITION_CELLIS
+                            || $conditional->getConditionType() === Conditional::CONDITION_CONTAINSTEXT
+                            || $conditional->getConditionType() === Conditional::CONDITION_NOTCONTAINSTEXT
+                        ) && $conditional->getOperatorType() !== Conditional::OPERATOR_NONE,
                         'operator',
                         $conditional->getOperatorType()
                     );
@@ -646,8 +646,8 @@ class Worksheet extends WriterPart
                     self::writeAttributeIf($objWriter, $conditional->getStopIfTrue(), 'stopIfTrue', '1');
 
                     if (
-                        $conditional->getConditionType() == Conditional::CONDITION_CONTAINSTEXT
-                        || $conditional->getConditionType() == Conditional::CONDITION_NOTCONTAINSTEXT
+                        $conditional->getConditionType() === Conditional::CONDITION_CONTAINSTEXT
+                        || $conditional->getConditionType() === Conditional::CONDITION_NOTCONTAINSTEXT
                     ) {
                         self::writeTextCondElements($objWriter, $conditional, $cellCoordinate);
                     } else {