diff --git a/src/Carbon/CarbonInterval.php b/src/Carbon/CarbonInterval.php
index 34820098d2..5ba85db757 100644
--- a/src/Carbon/CarbonInterval.php
+++ b/src/Carbon/CarbonInterval.php
@@ -296,12 +296,6 @@ class CarbonInterval extends DateInterval implements CarbonConverterInterface
 
     protected ?array $initialValues = null;
 
-    /**
-     * Total number of days the interval spans. If this is unknown, days will be FALSE.
-     * @var int|false
-     */
-    private $days = false;
-
     /**
      * Set the instance's timezone from a string or object.
      */
@@ -315,7 +309,6 @@ public function setTimezone(DateTimeZone|string|int $timezone): static
                 ->avoidMutation()
                 ->setTimezone($timezone);
             $this->rawInterval = null;
-            $this->days = false;
         }
 
         if ($this->endDate) {
@@ -323,7 +316,6 @@ public function setTimezone(DateTimeZone|string|int $timezone): static
                 ->avoidMutation()
                 ->setTimezone($timezone);
             $this->rawInterval = null;
-            $this->days = false;
         }
 
         return $this;
@@ -342,7 +334,6 @@ public function shiftTimezone(DateTimeZone|string|int $timezone): static
                 ->avoidMutation()
                 ->shiftTimezone($timezone);
             $this->rawInterval = null;
-            $this->days = false;
         }
 
         if ($this->endDate) {
@@ -350,7 +341,6 @@ public function shiftTimezone(DateTimeZone|string|int $timezone): static
                 ->avoidMutation()
                 ->shiftTimezone($timezone);
             $this->rawInterval = null;
-            $this->days = false;
         }
 
         return $this;
@@ -801,7 +791,6 @@ public function optimize(): static
         $this->startDate = null;
         $this->endDate = null;
         $this->rawInterval = null;
-        $this->days = false;
 
         return $this;
     }
@@ -1116,7 +1105,6 @@ public static function diff($start, $end = null, bool $absolute = false, array $
         $interval = static::instance($rawInterval, $skip);
 
         $interval->rawInterval = $rawInterval;
-        $interval->days = $rawInterval->days;
         $interval->startDate = $start;
         $interval->endDate = $end;
         $interval->initialValues = $interval->getInnerValues();
@@ -1356,7 +1344,6 @@ public function __get(string $name): int|float|string|null
      */
     public function set($name, $value = null): static
     {
-        $this->days = false;
         $properties = \is_array($name) ? $name : [$name => $value];
 
         foreach ($properties as $key => $value) {
@@ -3353,7 +3340,6 @@ private function checkStartAndEnd(): void
             $this->startDate = null;
             $this->endDate = null;
             $this->rawInterval = null;
-            $this->days = false;
         }
     }
 
diff --git a/tests/CarbonInterval/ConstructTest.php b/tests/CarbonInterval/ConstructTest.php
index f6bf9b9868..d430c5ea8c 100644
--- a/tests/CarbonInterval/ConstructTest.php
+++ b/tests/CarbonInterval/ConstructTest.php
@@ -449,12 +449,18 @@ public function testFromSerialization()
 
         // Ignore translator for the English comparison
         $copy->setLocalTranslator($interval->getLocalTranslator());
+        (function () {
+            $this->days ??= false;
+        })->call($copy);
 
         $this->assertEquals($interval, $copy);
 
         $interval = $today->locale('ja')->diffAsCarbonInterval($past);
         /** @var CarbonInterval $copy */
         $copy =  unserialize(serialize($interval));
+        (function () {
+            $this->days ??= false;
+        })->call($copy);
 
         $this->assertInstanceOf(CarbonInterval::class, $copy);