diff --git a/mago.toml b/mago.toml
index 8656dc6..3a76ed7 100644
--- a/mago.toml
+++ b/mago.toml
@@ -25,7 +25,7 @@ empty-line-before-return = true
 integrations = ["phpunit"]
 
 [linter.rules]
-ambiguous-function-call = { enabled = false }
+ambiguous-function-call = { enabled = true }
 literal-named-argument = { enabled = false }
 halstead = { effort-threshold = 7000 }
 final-controller = { enabled = false }
diff --git a/src/NodeProcessor/AbstractNodeProcessor.php b/src/NodeProcessor/AbstractNodeProcessor.php
index da5f3eb..a8f43b8 100644
--- a/src/NodeProcessor/AbstractNodeProcessor.php
+++ b/src/NodeProcessor/AbstractNodeProcessor.php
@@ -14,7 +14,7 @@ class AbstractNodeProcessor implements NodeProcessorInterface
     public function getNodePath(): string
     {
         $constName = \get_class($this) . '::NODE_PATH';
-        if (!defined($constName)) {
+        if (!\defined($constName)) {
             throw new Exception('NODE_PATH not defined in ' . static::class);
         }
 
diff --git a/tests/Unit/Behat/NodeProcessor/ArrayNodeProcessorTest.php b/tests/Unit/Behat/NodeProcessor/ArrayNodeProcessorTest.php
index 46ca9ed..52c73ab 100644
--- a/tests/Unit/Behat/NodeProcessor/ArrayNodeProcessorTest.php
+++ b/tests/Unit/Behat/NodeProcessor/ArrayNodeProcessorTest.php
@@ -24,7 +24,7 @@ function testGetSubscribedEvents(): void
         $nodeProcessor = new ArrayNodeProcessor();
         $context = $this->getMockBuilder(XmlProcessorContext::class)->disableOriginalConstructor()->getMock();
         self::assertIsIterable($nodeProcessor->getSubscribedEvents('test', $context));
-        $events = iterator_to_array($nodeProcessor->getSubscribedEvents('test', $context));
+        $events = \iterator_to_array($nodeProcessor->getSubscribedEvents('test', $context));
         self::assertEquals(
             [
                 XmlProcessor::NODE_TYPE_ELEMENT => [$nodeProcessor, 'openElement'],
diff --git a/tests/Unit/XmlProcessorTest.php b/tests/Unit/XmlProcessorTest.php
index bb01908..284fb40 100644
--- a/tests/Unit/XmlProcessorTest.php
+++ b/tests/Unit/XmlProcessorTest.php
@@ -35,7 +35,7 @@ public function testGetProcessor(): void
         $xmlProcessor = new XmlProcessor([$nodeProcessor]);
 
         self::assertInstanceOf(TestNodeProcessor::class, $xmlProcessor->getProcessor(TestNodeProcessor::class));
-        self::assertInstanceOf(get_class($nodeProcessor), $xmlProcessor->getProcessor(TestNodeProcessor::class));
+        self::assertInstanceOf(\get_class($nodeProcessor), $xmlProcessor->getProcessor(TestNodeProcessor::class));
         self::assertNull($xmlProcessor->getProcessor(OpenNodeProcessorInterface::class));
     }