diff --git a/src/ServiceMap.php b/src/ServiceMap.php
index c770aeb..39778af 100644
--- a/src/ServiceMap.php
+++ b/src/ServiceMap.php
@@ -9,13 +9,19 @@
 use PhpParser\Node\Expr\ClassConstFetch;
 use PhpParser\Node\Name;
 use PhpParser\Node\Scalar\String_;
-use ReflectionException;
 use ReflectionFunction;
 use ReflectionNamedType;
 use RuntimeException;
 
 /**
  * @phpstan-type Yii2Definition object|string|Closure|array{class?: string, __class?: string}
+ * @phpstan-type YII2ContainerConfig array{
+ *     container?: array{
+ *         singletons?: array<string, Yii2Definition>,
+ *         definitions?: array<string, Yii2Definition>,
+ *     },
+ *     components?: array<string, Yii2Definition>,
+ * }
  */
 final class ServiceMap {
 
@@ -46,7 +52,8 @@ final class ServiceMap {
     private array $components = [];
 
     /**
-     * @throws RuntimeException|ReflectionException
+     * @throws \RuntimeException
+     * @throws \ReflectionException
      */
     public function __construct(string $configPath) {
         if (!file_exists($configPath)) {
@@ -58,26 +65,18 @@ public function __construct(string $configPath) {
         defined('YII_ENV_PROD') || define('YII_ENV_PROD', false);
         defined('YII_ENV_TEST') || define('YII_ENV_TEST', true);
 
-        /**
-         * @var array{
-         *     container?: array{
-         *         singletons?: array<string, Yii2Definition>,
-         *         definitions?: array<string, Yii2Definition>,
-         *     },
-         *     components?: array<string, Yii2Definition>,
-         * } $config
-         */
+        /** @var YII2ContainerConfig $config */
         $config = require $configPath;
         foreach ($config['container']['singletons'] ?? [] as $id => $definition) {
-            $this->services[$id] = $this->guessDefinition($id, $definition);
+            $this->services[$id] = $this->guessDefinition($id, $definition, $config);
         }
 
         foreach ($config['container']['definitions'] ?? [] as $id => $definition) {
-            $this->services[$id] = $this->guessDefinition($id, $definition);
+            $this->services[$id] = $this->guessDefinition($id, $definition, $config);
         }
 
         foreach ($config['components'] ?? [] as $id => $definition) {
-            $this->components[$id] = $this->guessDefinition($id, $definition);
+            $this->components[$id] = $this->guessDefinition($id, $definition, $config);
         }
     }
 
@@ -99,13 +98,12 @@ public function getComponentClassById(string $id): ?string {
 
     /**
      * @param Yii2Definition $definition
-     * @throws RuntimeException|ReflectionException
+     * @param YII2ContainerConfig $config
+     *
+     * @throws \RuntimeException
+     * @throws \ReflectionException
      */
-    private function guessDefinition(string $id, $definition): string {
-        if (is_string($definition) && (class_exists($definition) || interface_exists($definition))) {
-            return $definition;
-        }
-
+    private function guessDefinition(string $id, $definition, $config): string {
         if ($definition instanceof Closure) {
             $returnType = (new ReflectionFunction($definition))->getReturnType();
             if ($returnType instanceof ReflectionNamedType) {
@@ -137,6 +135,20 @@ private function guessDefinition(string $id, $definition): string {
             }
         }
 
+        if (is_string($definition)) {
+            if (isset($config['container']['definitions'][$definition])) {
+                return $this->guessDefinition($definition, $config['container']['definitions'][$definition], $config);
+            }
+
+            if (isset($config['container']['singletons'][$definition])) {
+                return $this->guessDefinition($definition, $config['container']['singletons'][$definition], $config);
+            }
+
+            if (class_exists($definition) || interface_exists($definition)) {
+                return $definition;
+            }
+        }
+
         if (class_exists($id)) {
             return $id;
         }
diff --git a/tests/ServiceMapTest.php b/tests/ServiceMapTest.php
index d5f60b9..1e51d3f 100644
--- a/tests/ServiceMapTest.php
+++ b/tests/ServiceMapTest.php
@@ -39,6 +39,7 @@ public function testItLoadsServicesAndComponents(): void {
         $this->assertSame(CacheInterface::class, $serviceMap->getComponentClassById('componentToContainer'));
         $this->assertSame(Request::class, $serviceMap->getComponentClassById('request'));
         $this->assertSame(Response::class, $serviceMap->getComponentClassById('response'));
+        $this->assertSame(\yii\caching\ArrayCache::class, $serviceMap->getComponentClassById('cache'));
     }
 
     public function testThrowExceptionWhenConfigurationFileDoesNotExist(): void {
diff --git a/tests/assets/yii-config-valid.php b/tests/assets/yii-config-valid.php
index 9f083e2..df161fe 100644
--- a/tests/assets/yii-config-valid.php
+++ b/tests/assets/yii-config-valid.php
@@ -13,6 +13,7 @@
         'request' => [
             'baseUrl' => '/',
         ],
+        'cache' => 'cache.definition',
     ],
     'container' => [
         'singletons' => [
@@ -34,6 +35,7 @@ public function __toString(): string {
                 'flag' => 'foo',
             ],
             Throwable::class => Exception::class,
+            'cache.definition' => yii\caching\ArrayCache::class,
         ],
     ],
 ];