diff --git a/src/Rules/Classes/LocalTypeAliasesCheck.php b/src/Rules/Classes/LocalTypeAliasesCheck.php
index f71222e44..cd6362f8d 100644
--- a/src/Rules/Classes/LocalTypeAliasesCheck.php
+++ b/src/Rules/Classes/LocalTypeAliasesCheck.php
@@ -12,6 +12,7 @@
 use PHPStan\Rules\ClassNameNodePair;
 use PHPStan\Rules\IdentifierRuleError;
 use PHPStan\Rules\MissingTypehintCheck;
+use PHPStan\Rules\PhpDoc\UnresolvableTypeHelper;
 use PHPStan\Rules\RuleErrorBuilder;
 use PHPStan\Type\CircularTypeAliasErrorType;
 use PHPStan\Type\ErrorType;
@@ -37,6 +38,7 @@ public function __construct(
 		private TypeNodeResolver $typeNodeResolver,
 		private MissingTypehintCheck $missingTypehintCheck,
 		private ClassNameCheck $classCheck,
+		private UnresolvableTypeHelper $unresolvableTypeHelper,
 		private bool $checkMissingTypehints,
 		private bool $checkClassCaseSensitivity,
 		private bool $absentTypeChecks,
@@ -248,6 +250,12 @@ public function check(ClassReflection $reflection, ClassLike $node): array
 					);
 				}
 			}
+
+			if ($this->unresolvableTypeHelper->containsUnresolvableType($resolvedType)) {
+				$errors[] = RuleErrorBuilder::message(sprintf('Type alias %s contains unresolvable type.', $aliasName))
+					->identifier('typeAlias.unresolvableType')
+					->build();
+			}
 		}
 
 		return $errors;
diff --git a/tests/PHPStan/Rules/Classes/LocalTypeAliasesRuleTest.php b/tests/PHPStan/Rules/Classes/LocalTypeAliasesRuleTest.php
index 7cdffa770..089014a7a 100644
--- a/tests/PHPStan/Rules/Classes/LocalTypeAliasesRuleTest.php
+++ b/tests/PHPStan/Rules/Classes/LocalTypeAliasesRuleTest.php
@@ -7,6 +7,7 @@
 use PHPStan\Rules\ClassForbiddenNameCheck;
 use PHPStan\Rules\ClassNameCheck;
 use PHPStan\Rules\MissingTypehintCheck;
+use PHPStan\Rules\PhpDoc\UnresolvableTypeHelper;
 use PHPStan\Rules\Rule;
 use PHPStan\Testing\RuleTestCase;
 use const PHP_VERSION_ID;
@@ -31,6 +32,7 @@ protected function getRule(): Rule
 					new ClassCaseSensitivityCheck($reflectionProvider, true),
 					new ClassForbiddenNameCheck(self::getContainer()),
 				),
+				new UnresolvableTypeHelper(),
 				true,
 				true,
 				true,
@@ -131,6 +133,10 @@ public function testRule(): void
 				'Class LocalTypeAliases\Foo referenced with incorrect case: LocalTypeAliases\fOO.',
 				87,
 			],
+			[
+				'Type alias A contains unresolvable type.',
+				95,
+			],
 		]);
 	}
 
diff --git a/tests/PHPStan/Rules/Classes/LocalTypeTraitAliasesRuleTest.php b/tests/PHPStan/Rules/Classes/LocalTypeTraitAliasesRuleTest.php
index 7106d6599..1f53ff745 100644
--- a/tests/PHPStan/Rules/Classes/LocalTypeTraitAliasesRuleTest.php
+++ b/tests/PHPStan/Rules/Classes/LocalTypeTraitAliasesRuleTest.php
@@ -7,6 +7,7 @@
 use PHPStan\Rules\ClassForbiddenNameCheck;
 use PHPStan\Rules\ClassNameCheck;
 use PHPStan\Rules\MissingTypehintCheck;
+use PHPStan\Rules\PhpDoc\UnresolvableTypeHelper;
 use PHPStan\Rules\Rule;
 use PHPStan\Testing\RuleTestCase;
 
@@ -30,6 +31,7 @@ protected function getRule(): Rule
 					new ClassCaseSensitivityCheck($reflectionProvider, true),
 					new ClassForbiddenNameCheck(self::getContainer()),
 				),
+				new UnresolvableTypeHelper(),
 				true,
 				true,
 				true,
diff --git a/tests/PHPStan/Rules/Classes/data/local-type-aliases.php b/tests/PHPStan/Rules/Classes/data/local-type-aliases.php
index ba4c47f57..5aa52e908 100644
--- a/tests/PHPStan/Rules/Classes/data/local-type-aliases.php
+++ b/tests/PHPStan/Rules/Classes/data/local-type-aliases.php
@@ -88,3 +88,11 @@ class NonexistentClasses
 {
 
 }
+
+/**
+ * @phpstan-type A = string&int
+ */
+class UnresolvableExample
+{
+
+}