diff --git a/src/OpeningHours.php b/src/OpeningHours.php
index 9c3aa6c..97c4699 100644
--- a/src/OpeningHours.php
+++ b/src/OpeningHours.php
@@ -845,7 +845,7 @@ protected function getOpeningHoursFromStrings(array $openingHours): OpeningHours
 
     protected function setExceptionsFromStrings(array $exceptions): void
     {
-        if (empty($exceptions)) {
+        if ($exceptions === []) {
             return;
         }
 
diff --git a/src/OpeningHoursForDay.php b/src/OpeningHoursForDay.php
index fac58dc..72a1675 100644
--- a/src/OpeningHoursForDay.php
+++ b/src/OpeningHoursForDay.php
@@ -249,7 +249,7 @@ public function forNightTime(Time $time): Generator
 
     public function isEmpty(): bool
     {
-        return empty($this->openingHours);
+        return $this->openingHours === [];
     }
 
     public function map(callable $callback): array