diff --git a/src/model/parts/InterfacesPart.php b/src/model/parts/InterfacesPart.php
index 4f1de80..b5fe09a 100644
--- a/src/model/parts/InterfacesPart.php
+++ b/src/model/parts/InterfacesPart.php
@@ -15,7 +15,7 @@ trait InterfacesPart {
 
 	/** @var Set */
 	private $interfaces;
-	
+
 	private function initInterfaces() {
 		$this->interfaces = new Set();
 	}
@@ -97,11 +97,11 @@ public function hasInterfaces() {
 	 */
 	public function hasInterface($interface) {
 		if ($interface instanceof PhpInterface) {
-			return $this->interfaces->contains($interface->getName()) 
+			return $this->interfaces->contains($interface->getName())
 				|| $this->interfaces->contains($interface->getQualifiedName());
 		}
 
-		return $this->hasInterface(new PhpInterface($interface));
+		return $this->interfaces->contains($interface) || $this->hasInterface(new PhpInterface($interface));
 	}
 
 	/**
diff --git a/src/parser/visitor/ClassParserVisitor.php b/src/parser/visitor/ClassParserVisitor.php
index b108a44..a2b2f24 100644
--- a/src/parser/visitor/ClassParserVisitor.php
+++ b/src/parser/visitor/ClassParserVisitor.php
@@ -5,12 +5,12 @@
 use PhpParser\Node\Stmt\Class_;
 
 class ClassParserVisitor extends StructParserVisitor {
-	
+
 	use StructParserPart;
 
 	public function visitClass(Class_ $node) {
 		$struct = $this->getStruct();
-		
+
 		if ($node->extends !== null) {
 			if ($node->extends->getType() === 'Name_FullyQualified') {
 				$struct->setParentClassName('\\' . implode('\\', $node->extends->parts));
@@ -19,8 +19,12 @@ public function visitClass(Class_ $node) {
 			}
 		}
 
-		foreach ($node->implements as $name) {
-			$struct->addInterface(implode('\\', $name->parts));
+		foreach ($node->implements as $interface) {
+			if ($interface->getType() === 'Name_FullyQualified') {
+				$struct->addInterface('\\' . implode('\\', $interface->parts));
+			} else {
+				$struct->addInterface(implode('\\', $interface->parts));
+			}
 		}
 
 		$struct->setAbstract($node->isAbstract());
diff --git a/tests/fixtures/MyCollection.php b/tests/fixtures/MyCollection.php
index 520bb2c..c648ddd 100644
--- a/tests/fixtures/MyCollection.php
+++ b/tests/fixtures/MyCollection.php
@@ -1,4 +1,3 @@
 <?php
 class MyCollection extends phootwork\collection\AbstractCollection implements phootwork\collection\Collection {
-
-}
\ No newline at end of file
+}
diff --git a/tests/fixtures/MyCollection2.php b/tests/fixtures/MyCollection2.php
index f460a74..3fdaf3d 100644
--- a/tests/fixtures/MyCollection2.php
+++ b/tests/fixtures/MyCollection2.php
@@ -1,4 +1,3 @@
 <?php
 class MyCollection2 extends \phootwork\collection\AbstractCollection implements \phootwork\collection\Collection {
-
 }
diff --git a/tests/generator/ClassGeneratorTest.php b/tests/generator/ClassGeneratorTest.php
index c731493..d99d348 100644
--- a/tests/generator/ClassGeneratorTest.php
+++ b/tests/generator/ClassGeneratorTest.php
@@ -12,7 +12,7 @@
  * @group generator
  */
 class ClassGeneratorTest extends \PHPUnit_Framework_TestCase {
-	
+
 	use TestUtils;
 
 	public function testSignature() {
@@ -24,34 +24,34 @@ public function testSignature() {
 
 		$this->assertEquals($expected, $code);
 	}
-	
+
 	public function testAbstract() {
 		$expected = 'abstract class MyClass {' . "\n" . '}';
-	
+
 		$class = PhpClass::create('MyClass')->setAbstract(true);
 		$generator = new ModelGenerator();
 		$code = $generator->generate($class);
-	
+
 		$this->assertEquals($expected, $code);
 	}
-	
+
 	public function testFinal() {
 		$expected = 'final class MyClass {' . "\n" . '}';
-	
+
 		$class = PhpClass::create('MyClass')->setFinal(true);
 		$generator = new ModelGenerator();
 		$code = $generator->generate($class);
-	
+
 		$this->assertEquals($expected, $code);
 	}
-	
+
 	public function testInterfaces() {
 		$generator = new ModelGenerator();
-	
+
 		$expected = 'class MyClass implements \Iterator {' . "\n" . '}';
 		$class = PhpClass::create('MyClass')->addInterface('\Iterator');
 		$this->assertEquals($expected, $generator->generate($class));
-	
+
 		$expected = 'class MyClass implements \Iterator, \ArrayAccess {' . "\n" . '}';
 		$class = PhpClass::create('MyClass')->addInterface('\Iterator')->addInterface('\ArrayAccess');
 		$this->assertEquals($expected, $generator->generate($class));
@@ -59,51 +59,51 @@ public function testInterfaces() {
 
 	public function testParent() {
 		$expected = 'class MyClass extends MyParent {' . "\n" . '}';
-	
+
 		$class = PhpClass::create('MyClass')->setParentClassName('MyParent');
 		$generator = new ModelGenerator();
 		$code = $generator->generate($class);
-	
+
 		$this->assertEquals($expected, $code);
 	}
 
 	public function testUseStatements() {
 		$class = new PhpClass('Foo\\Bar');
 		$class->addUseStatement('Bam\\Baz');
-	
+
 		$codegen = new CodeFileGenerator(['generateDocblock' => false, 'generateEmptyDocblock' => false]);
 		$code = $codegen->generate($class);
-	
+
 		$this->assertEquals($this->getGeneratedContent('FooBar.php'), $code);
-	
+
 		$class = new PhpClass('Foo\\Bar');
 		$class->addUseStatement('Bam\\Baz', 'BamBaz');
-	
+
 		$codegen = new CodeFileGenerator(['generateDocblock' => false, 'generateEmptyDocblock' => false]);
 		$code = $codegen->generate($class);
-	
+
 		$this->assertEquals($this->getGeneratedContent('FooBarWithAlias.php'), $code);
-		
+
 		$class = new PhpClass('Foo');
 		$class->addUseStatement('Bar');
-		
+
 		$generator = new ModelGenerator();
 		$code = $generator->generate($class);
 		$expected = 'class Foo {' . "\n" . '}';
-		
+
 		$this->assertEquals($expected, $code);
 	}
 
 	public function testABClass() {
 		$class = Fixtures::createABClass();
-	
+
 		$modelGenerator = new ModelGenerator();
 		$modelCode = $modelGenerator->generate($class);
 		$this->assertEquals($this->getGeneratedContent('ABClass.php'), $modelCode);
 		$generator = new CodeGenerator(['generateDocblock' => false]);
 		$code = $generator->generate($class);
 		$this->assertEquals($modelCode, $code);
-		
+
 		$modelGenerator = new ModelGenerator(['generateDocblock' => true]);
 		$modelCode = $modelGenerator->generate($class);
 		$this->assertEquals($this->getGeneratedContent('ABClassWithComments.php'), $modelCode);
@@ -111,16 +111,34 @@ public function testABClass() {
 		$code = $generator->generate($class);
 		$this->assertEquals($modelCode, $code);
 	}
-	
+
 	public function testRequireTraitsClass() {
 		$class = PhpClass::create('RequireTraitsClass')
 			->addRequiredFile('FooBar.php')
 			->addRequiredFile('ABClass.php')
 			->addTrait('Iterator');
-		
+
 		$generator = new ModelGenerator();
 		$code = $generator->generate($class);
 		$this->assertEquals($this->getGeneratedContent('RequireTraitsClass.php'), $code);
 	}
 
+	public function testMyCollection() {
+		$class = PhpClass::fromFile(__DIR__ . '/../fixtures/MyCollection.php');
+
+		$generator = new CodeFileGenerator(['generateDocblock' => false]);
+		$code = $generator->generate($class);
+
+		$this->assertEquals($this->getFixtureContent('MyCollection.php'), $code);
+	}
+
+	public function testMyCollection2() {
+		$class = PhpClass::fromFile(__DIR__ . '/../fixtures/MyCollection2.php');
+
+		$generator = new CodeFileGenerator(['generateDocblock' => false]);
+		$code = $generator->generate($class);
+
+		$this->assertEquals($this->getFixtureContent('MyCollection2.php'), $code);
+	}
+
 }
diff --git a/tests/model/ClassTest.php b/tests/model/ClassTest.php
index f7b3456..1af2443 100644
--- a/tests/model/ClassTest.php
+++ b/tests/model/ClassTest.php
@@ -133,6 +133,10 @@ public function testInterfaces() {
 		$this->assertTrue($class->hasUseStatement('other\name\space\Interface'));
 		$this->assertSame($class, $class->removeInterface('other\name\space\Interface'));
 		$this->assertTrue($class->hasUseStatement('other\name\space\Interface'));
+
+		$class->addInterface('\my\Interface');
+		$this->assertTrue($class->hasInterface('\my\Interface'));
+		$this->assertFalse($class->hasInterface('my\Interface'));
 	}
 
 	public function testTraits() {
diff --git a/tests/parser/ClassParserTest.php b/tests/parser/ClassParserTest.php
index 92c097c..acbc168 100644
--- a/tests/parser/ClassParserTest.php
+++ b/tests/parser/ClassParserTest.php
@@ -10,7 +10,7 @@
  * @group parser
  */
 class ClassParserTest extends \PHPUnit_Framework_TestCase {
-	
+
 	use ModelAssertions;
 	use ValueTests;
 
@@ -47,7 +47,7 @@ public function testClassWithConstants() {
 
 		$this->assertTrue($class->hasConstant('NMBR'));
 		$this->assertEquals(300, $class->getConstant('NMBR')->getValue());
-		
+
 		$this->assertTrue($class->hasConstant('BAR'));
 		$this->assertEquals('self::FOO', $class->getConstant('BAR')->getExpression());
 	}
@@ -67,10 +67,18 @@ public function testClassWithValues() {
 		$class = PhpClass::fromFile(__DIR__ . '/../fixtures/ClassWithValues.php');
 		$this->assertClassWithValues($class);
 	}
-	
+
+	public function testTypeClass() {
+		$class = PhpClass::fromFile(__DIR__ . '/../fixtures/TypeClass.php');
+
+		$doSomething = $class->getMethod('doSomething');
+		$options = $doSomething->getParameter('options');
+		$this->assertEquals('Symfony\Component\OptionsResolver\OptionsResolver', $options->getType());
+	}
+
 	public function testMyCollection() {
 		$class = PhpClass::fromFile(__DIR__ . '/../fixtures/MyCollection.php');
-		
+
 		$this->assertEquals('phootwork\collection\AbstractCollection', $class->getParentClassName());
 		$this->assertTrue($class->hasInterface('phootwork\collection\Collection'));
 	}
@@ -81,13 +89,5 @@ public function testMyCollection2() {
 		$this->assertEquals('\phootwork\collection\AbstractCollection', $class->getParentClassName());
 		$this->assertTrue($class->hasInterface('\phootwork\collection\Collection'));
 	}
-	
-	public function testTypeClass() {
-		$class = PhpClass::fromFile(__DIR__ . '/../fixtures/TypeClass.php');
-		
-		$doSomething = $class->getMethod('doSomething');
-		$options = $doSomething->getParameter('options');
-		$this->assertEquals('Symfony\Component\OptionsResolver\OptionsResolver', $options->getType());
-	}
-	
+
 }