diff --git a/src/Rules/PHPUnit/DataProviderHelper.php b/src/Rules/PHPUnit/DataProviderHelper.php
index e88f293..a224cb7 100644
--- a/src/Rules/PHPUnit/DataProviderHelper.php
+++ b/src/Rules/PHPUnit/DataProviderHelper.php
@@ -5,16 +5,32 @@
 use PHPStan\Analyser\Scope;
 use PHPStan\PhpDoc\ResolvedPhpDocBlock;
 use PHPStan\PhpDocParser\Ast\PhpDoc\PhpDocTagNode;
+use PHPStan\Reflection\ClassReflection;
 use PHPStan\Reflection\MissingMethodFromReflectionException;
+use PHPStan\Reflection\ReflectionProvider;
 use PHPStan\Rules\RuleError;
 use PHPStan\Rules\RuleErrorBuilder;
 use function array_merge;
+use function count;
+use function explode;
 use function preg_match;
 use function sprintf;
 
 class DataProviderHelper
 {
 
+	/**
+	 * Reflection provider.
+	 *
+	 * @var ReflectionProvider
+	 */
+	private $reflectionProvider;
+
+	public function __construct(ReflectionProvider $reflectionProvider)
+	{
+		$this->reflectionProvider = $reflectionProvider;
+	}
+
 	/**
 	 * @return array<PhpDocTagNode>
 	 */
@@ -48,24 +64,28 @@ public function processDataProvider(
 		bool $deprecationRulesInstalled
 	): array
 	{
-		$dataProviderName = $this->getDataProviderName($phpDocTag);
-		if ($dataProviderName === null) {
-			// Missing name is already handled in NoMissingSpaceInMethodAnnotationRule
+		$dataProviderValue = $this->getDataProviderValue($phpDocTag);
+		if ($dataProviderValue === null) {
+			// Missing value is already handled in NoMissingSpaceInMethodAnnotationRule
 			return [];
 		}
 
-		$classReflection = $scope->getClassReflection();
+		[$classReflection, $method] = $this->parseDataProviderValue($scope, $dataProviderValue);
 		if ($classReflection === null) {
-			// Should not happen
-			return [];
+			$error = RuleErrorBuilder::message(sprintf(
+				'@dataProvider %s related class not found.',
+				$dataProviderValue
+			))->build();
+
+			return [$error];
 		}
 
 		try {
-			$dataProviderMethodReflection = $classReflection->getNativeMethod($dataProviderName);
+			$dataProviderMethodReflection = $classReflection->getNativeMethod($method);
 		} catch (MissingMethodFromReflectionException $missingMethodFromReflectionException) {
 			$error = RuleErrorBuilder::message(sprintf(
 				'@dataProvider %s related method not found.',
-				$dataProviderName
+				$dataProviderValue
 			))->build();
 
 			return [$error];
@@ -73,10 +93,10 @@ public function processDataProvider(
 
 		$errors = [];
 
-		if ($checkFunctionNameCase && $dataProviderName !== $dataProviderMethodReflection->getName()) {
+		if ($checkFunctionNameCase && $method !== $dataProviderMethodReflection->getName()) {
 			$errors[] = RuleErrorBuilder::message(sprintf(
 				'@dataProvider %s related method is used with incorrect case: %s.',
-				$dataProviderName,
+				$dataProviderValue,
 				$dataProviderMethodReflection->getName()
 			))->build();
 		}
@@ -84,21 +104,21 @@ public function processDataProvider(
 		if (!$dataProviderMethodReflection->isPublic()) {
 			$errors[] = RuleErrorBuilder::message(sprintf(
 				'@dataProvider %s related method must be public.',
-				$dataProviderName
+				$dataProviderValue
 			))->build();
 		}
 
 		if ($deprecationRulesInstalled && !$dataProviderMethodReflection->isStatic()) {
 			$errors[] = RuleErrorBuilder::message(sprintf(
 				'@dataProvider %s related method must be static.',
-				$dataProviderName
+				$dataProviderValue
 			))->build();
 		}
 
 		return $errors;
 	}
 
-	private function getDataProviderName(PhpDocTagNode $phpDocTag): ?string
+	private function getDataProviderValue(PhpDocTagNode $phpDocTag): ?string
 	{
 		if (preg_match('/^[^ \t]+/', (string) $phpDocTag->value, $matches) !== 1) {
 			return null;
@@ -107,4 +127,21 @@ private function getDataProviderName(PhpDocTagNode $phpDocTag): ?string
 		return $matches[0];
 	}
 
+	/**
+	 * @return array{ClassReflection|null, string}
+	 */
+	private function parseDataProviderValue(Scope $scope, string $dataProviderValue): array
+	{
+		$parts = explode('::', $dataProviderValue, 2);
+		if (count($parts) <= 1) {
+			return [$scope->getClassReflection(), $dataProviderValue];
+		}
+
+		if ($this->reflectionProvider->hasClass($parts[0])) {
+			return [$this->reflectionProvider->getClass($parts[0]), $parts[1]];
+		}
+
+		return [null, $dataProviderValue];
+	}
+
 }
diff --git a/tests/Rules/PHPUnit/DataProviderDeclarationRuleTest.php b/tests/Rules/PHPUnit/DataProviderDeclarationRuleTest.php
index cfd27ae..04dad8d 100644
--- a/tests/Rules/PHPUnit/DataProviderDeclarationRuleTest.php
+++ b/tests/Rules/PHPUnit/DataProviderDeclarationRuleTest.php
@@ -14,8 +14,10 @@ class DataProviderDeclarationRuleTest extends RuleTestCase
 
 	protected function getRule(): Rule
 	{
+		$reflection = $this->createReflectionProvider();
+
 		return new DataProviderDeclarationRule(
-			new DataProviderHelper(),
+			new DataProviderHelper($reflection),
 			self::getContainer()->getByType(FileTypeMapper::class),
 			true,
 			true
@@ -27,19 +29,23 @@ public function testRule(): void
 		$this->analyse([__DIR__ . '/data/data-provider-declaration.php'], [
 			[
 				'@dataProvider providebaz related method is used with incorrect case: provideBaz.',
-				13,
+				14,
 			],
 			[
 				'@dataProvider provideQux related method must be static.',
-				13,
+				14,
 			],
 			[
 				'@dataProvider provideQuux related method must be public.',
-				13,
+				14,
 			],
 			[
 				'@dataProvider provideNonExisting related method not found.',
-				66,
+				68,
+			],
+			[
+				'@dataProvider NonExisting::provideNonExisting related class not found.',
+				68,
 			],
 		]);
 	}
diff --git a/tests/Rules/PHPUnit/data/data-provider-declaration.php b/tests/Rules/PHPUnit/data/data-provider-declaration.php
index 2690d02..23af826 100644
--- a/tests/Rules/PHPUnit/data/data-provider-declaration.php
+++ b/tests/Rules/PHPUnit/data/data-provider-declaration.php
@@ -9,6 +9,7 @@ class FooTestCase extends \PHPUnit\Framework\TestCase
 	 * @dataProvider providebaz
 	 * @dataProvider provideQux
 	 * @dataProvider provideQuux
+	 * @dataProvider \ExampleTestCase\BarTestCase::provideToOtherClass
 	 */
 	public function testIsNotFoo(string $subject): void
 	{
@@ -61,10 +62,18 @@ class BarTestCase extends \PHPUnit\Framework\TestCase
 
 	/**
 	 * @dataProvider provideNonExisting
+	 * @dataProvider NonExisting::provideNonExisting
 	 * @dataProvider provideCorge
 	 */
 	public function testIsNotBar(string $subject): void
 	{
 		self::assertNotSame('bar', $subject);
 	}
+
+	public static function provideToOtherClass(): iterable
+	{
+		return [
+			['toOtherClass'],
+		];
+	}
 }