diff --git a/src/Rules/Properties/AccessPropertiesRule.php b/src/Rules/Properties/AccessPropertiesRule.php
index 97bad6168ce..fdc27f0cd05 100644
--- a/src/Rules/Properties/AccessPropertiesRule.php
+++ b/src/Rules/Properties/AccessPropertiesRule.php
@@ -16,6 +16,7 @@
 use PHPStan\Type\Constant\ConstantStringType;
 use PHPStan\Type\ErrorType;
 use PHPStan\Type\Type;
+use PHPStan\Type\TypeUtils;
 use PHPStan\Type\VerbosityLevel;
 use function array_map;
 use function array_merge;
diff --git a/src/Type/Php/DateTimeZoneConstructorThrowTypeExtension.php b/src/Type/Php/DateTimeZoneConstructorThrowTypeExtension.php
index 4240b2b85f8..3715cc43292 100644
--- a/src/Type/Php/DateTimeZoneConstructorThrowTypeExtension.php
+++ b/src/Type/Php/DateTimeZoneConstructorThrowTypeExtension.php
@@ -10,7 +10,6 @@
 use PHPStan\Type\NeverType;
 use PHPStan\Type\Type;
 use PHPStan\Type\TypeCombinator;
-use PHPStan\Type\TypeUtils;
 use function count;
 
 class DateTimeZoneConstructorThrowTypeExtension implements DynamicStaticMethodThrowTypeExtension
@@ -28,7 +27,7 @@ public function getThrowTypeFromStaticMethodCall(MethodReflection $methodReflect
 		}
 
 		$valueType = $scope->getType($methodCall->getArgs()[0]->value);
-		$constantStrings = TypeUtils::getConstantStrings($valueType);
+		$constantStrings = $valueType->getConstantStrings();
 
 		foreach ($constantStrings as $constantString) {
 			try {
diff --git a/src/Type/Php/StrSplitFunctionReturnTypeExtension.php b/src/Type/Php/StrSplitFunctionReturnTypeExtension.php
index 6396da0099b..2cc1b3a98bf 100644
--- a/src/Type/Php/StrSplitFunctionReturnTypeExtension.php
+++ b/src/Type/Php/StrSplitFunctionReturnTypeExtension.php
@@ -20,7 +20,6 @@
 use PHPStan\Type\StringType;
 use PHPStan\Type\Type;
 use PHPStan\Type\TypeCombinator;
-use PHPStan\Type\TypeUtils;
 use function array_map;
 use function array_unique;
 use function count;
@@ -88,7 +87,7 @@ public function getTypeFromFunctionCall(FunctionReflection $functionReflection,
 
 		$stringType = $scope->getType($functionCall->getArgs()[0]->value);
 
-		$constantStrings = TypeUtils::getConstantStrings($stringType);
+		$constantStrings = $stringType->getConstantStrings();
 		if (count($constantStrings) > 0) {
 			$results = [];
 			foreach ($constantStrings as $constantString) {