diff --git a/src/Monolog/Handler/FingersCrossed/ActivationStrategyInterface.php b/src/Monolog/Handler/FingersCrossed/ActivationStrategyInterface.php
index b73854ad..3b765969 100644
--- a/src/Monolog/Handler/FingersCrossed/ActivationStrategyInterface.php
+++ b/src/Monolog/Handler/FingersCrossed/ActivationStrategyInterface.php
@@ -24,5 +24,5 @@ interface ActivationStrategyInterface
      * @param  array $record
      * @return bool
      */
-    public function isHandlerActivated(array $record);
+    public function isHandlerActivated(array $record): bool;
 }
diff --git a/src/Monolog/Handler/FingersCrossed/ChannelLevelActivationStrategy.php b/src/Monolog/Handler/FingersCrossed/ChannelLevelActivationStrategy.php
index 63a14cb6..8d0e4a2e 100644
--- a/src/Monolog/Handler/FingersCrossed/ChannelLevelActivationStrategy.php
+++ b/src/Monolog/Handler/FingersCrossed/ChannelLevelActivationStrategy.php
@@ -48,7 +48,7 @@ class ChannelLevelActivationStrategy implements ActivationStrategyInterface
         $this->channelToActionLevel = array_map('Monolog\Logger::toMonologLevel', $channelToActionLevel);
     }
 
-    public function isHandlerActivated(array $record)
+    public function isHandlerActivated(array $record): bool
     {
         if (isset($this->channelToActionLevel[$record['channel']])) {
             return $record['level'] >= $this->channelToActionLevel[$record['channel']];
diff --git a/src/Monolog/Handler/FingersCrossed/ErrorLevelActivationStrategy.php b/src/Monolog/Handler/FingersCrossed/ErrorLevelActivationStrategy.php
index d0ebd840..5a2a7991 100644
--- a/src/Monolog/Handler/FingersCrossed/ErrorLevelActivationStrategy.php
+++ b/src/Monolog/Handler/FingersCrossed/ErrorLevelActivationStrategy.php
@@ -27,7 +27,7 @@ class ErrorLevelActivationStrategy implements ActivationStrategyInterface
         $this->actionLevel = Logger::toMonologLevel($actionLevel);
     }
 
-    public function isHandlerActivated(array $record)
+    public function isHandlerActivated(array $record): bool
     {
         return $record['level'] >= $this->actionLevel;
     }