diff --git a/src/DI/Resolver.php b/src/DI/Resolver.php
index dd51c490c..3e6afc3ff 100644
--- a/src/DI/Resolver.php
+++ b/src/DI/Resolver.php
@@ -354,12 +354,11 @@ private function normalizeEntity(Statement $statement): string|array|Reference|n
 		}
 
 		if ($item instanceof Definition) {
-			$name = current(array_keys($this->builder->getDefinitions(), $item, strict: true));
-			if ($name === false) {
-				throw new ServiceCreationException(sprintf("Service '%s' not found in definitions.", $item->getName()));
-			}
+			if ($this->builder->getDefinition($item->getName()) !== $item) {
+				throw new ServiceCreationException(sprintf("Service '%s' does not match the expected service.", $item->getName()));
 
-			$item = new Reference($name);
+			}
+			$item = new Reference($item->getName());
 		}
 
 		if ($item instanceof Reference) {