diff --git a/src/Type/Php/ArrayKeysFunctionDynamicReturnTypeExtension.php b/src/Type/Php/ArrayKeysFunctionDynamicReturnTypeExtension.php
index 74a2903ea5..398113ca72 100644
--- a/src/Type/Php/ArrayKeysFunctionDynamicReturnTypeExtension.php
+++ b/src/Type/Php/ArrayKeysFunctionDynamicReturnTypeExtension.php
@@ -27,7 +27,7 @@ public function isFunctionSupported(FunctionReflection $functionReflection): boo
 
 	public function getTypeFromFunctionCall(FunctionReflection $functionReflection, FuncCall $functionCall, Scope $scope): ?Type
 	{
-		if (count($functionCall->getArgs()) !== 1) {
+		if (!isset($functionCall->getArgs()[0])) {
 			return null;
 		}