diff --git a/src/PhpDoc/TypeNodeResolver.php b/src/PhpDoc/TypeNodeResolver.php
index 975365a341..6abb943d73 100644
--- a/src/PhpDoc/TypeNodeResolver.php
+++ b/src/PhpDoc/TypeNodeResolver.php
@@ -199,7 +199,15 @@ private function resolveIdentifierTypeNode(IdentifierTypeNode $typeNode, NameSco
 	{
 		switch (strtolower($typeNode->name)) {
 			case 'int':
+				return new IntegerType();
+
 			case 'integer':
+				$type = $this->tryResolvePseudoTypeClassType($typeNode, $nameScope);
+
+				if ($type !== null) {
+					return $type;
+				}
+
 				return new IntegerType();
 
 			case 'positive-int':
diff --git a/tests/PHPStan/Analyser/nsrt/bug-12660.php b/tests/PHPStan/Analyser/nsrt/bug-12660.php
new file mode 100644
index 0000000000..44c79a0444
--- /dev/null
+++ b/tests/PHPStan/Analyser/nsrt/bug-12660.php
@@ -0,0 +1,21 @@
+<?php declare(strict_types = 1);
+
+namespace Bug12660;
+
+use function PHPStan\Testing\assertType;
+
+class Integer
+{
+	
+}
+
+class HelloWorld
+{
+	/**
+	 * @param Integer $integer
+	 */
+	public function sayHello($integer): void
+	{
+		assertType(Integer::class, $integer);
+	}
+}