diff --git a/src/Configurator/JavaScript.php b/src/Configurator/JavaScript.php
index 139ffdd26..ad8b38378 100644
--- a/src/Configurator/JavaScript.php
+++ b/src/Configurator/JavaScript.php
@@ -378,7 +378,7 @@ protected function getSource()
 		$src     = '';
 
 		// If getLogger() is not exported we use a dummy Logger that can be optimized away
-		$logger = (in_array('getLogger', $this->exports)) ? 'Logger.js' : 'NullLogger.js';
+		$logger = (in_array('getLogger', $this->exports, true)) ? 'Logger.js' : 'NullLogger.js';
 
 		// Prepare the list of files
 		$files   = glob($rootDir . '/Parser/AttributeFilters/*.js');
diff --git a/src/Plugins/HTMLElements/Configurator.php b/src/Plugins/HTMLElements/Configurator.php
index 7ee2f587c..a08b7be03 100644
--- a/src/Plugins/HTMLElements/Configurator.php
+++ b/src/Plugins/HTMLElements/Configurator.php
@@ -156,7 +156,7 @@ protected function allowElementWithSafety($elName, $allowUnsafe)
 		$elName  = $this->normalizeElementName($elName);
 		$tagName = $this->prefix . ':' . $elName;
 
-		if (!$allowUnsafe && in_array($elName, $this->unsafeElements))
+		if (!$allowUnsafe && in_array($elName, $this->unsafeElements, true))
 		{
 			throw new RuntimeException("'" . $elName . "' elements are unsafe and are disabled by default. Please use " . __CLASS__ . '::allowUnsafeElement() to bypass this security measure');
 		}
@@ -221,7 +221,7 @@ protected function allowAttributeWithSafety($elName, $attrName, $allowUnsafe)
 		if (!$allowUnsafe)
 		{
 			if (substr($attrName, 0, 2) === 'on'
-			 || in_array($attrName, $this->unsafeAttributes))
+			 || in_array($attrName, $this->unsafeAttributes, true))
 			{
 				throw new RuntimeException("'" . $attrName . "' attributes are unsafe and are disabled by default. Please use " . __CLASS__ . '::allowUnsafeAttribute() to bypass this security measure');
 			}