diff --git a/composer.json b/composer.json
index 7b70fe8..19114c2 100644
--- a/composer.json
+++ b/composer.json
@@ -18,7 +18,7 @@
         "php": "^8.0",
         "ext-tokenizer": "*",
         "league/pipeline": "^1.0.0",
-        "nikic/php-parser": "^4.11.0",
+        "nikic/php-parser": "4.11.0",
         "phpdocumentor/reflection-docblock": "^5.2",
         "phpdocumentor/type-resolver": "^1.4",
         "symfony/console": "^5.3.2",
diff --git a/src/Code/UseStatements.php b/src/Code/UseStatements.php
index 4bfd394..039fa86 100644
--- a/src/Code/UseStatements.php
+++ b/src/Code/UseStatements.php
@@ -27,6 +27,6 @@ public function fullyQualifiedNameFor(Name $name): string
                 return $useStatement->fullyQualifiedName($name);
             }
         }
-        return (string) $name;
+        return $name->fullName();
     }
 }
diff --git a/src/Code/Variables/TypeDeclaration.php b/src/Code/Variables/TypeDeclaration.php
index 4c90f3b..2997a5a 100644
--- a/src/Code/Variables/TypeDeclaration.php
+++ b/src/Code/Variables/TypeDeclaration.php
@@ -71,7 +71,7 @@ public function references(): array
             return [$this->isArray() ? new Name($this->removeArraySuffix()) : $this->names[0]];
         }
 
-        $typesFromUnion = array_map(static fn (Name $name) => TypeDeclaration::from((string) $name), $this->names);
+        $typesFromUnion = array_map(static fn (Name $name) => TypeDeclaration::from($name->fullName()), $this->names);
         $references = array_filter($typesFromUnion, static fn (TypeDeclaration $type) => ! $type->isBuiltIn());
 
         return array_map(
diff --git a/tests/unit/Code/UseStatementsTest.php b/tests/unit/Code/UseStatementsTest.php
index 4451b9d..2452551 100644
--- a/tests/unit/Code/UseStatementsTest.php
+++ b/tests/unit/Code/UseStatementsTest.php
@@ -24,4 +24,14 @@ function it_gets_fully_qualified_name_from_alias()
 
         $this->assertEquals('Package\\SubPackage\\AnotherClass', $fullyQualifiedName);
     }
+
+    /** @test */
+    function it_get_fully_qualified_name_if_not_imported()
+    {
+        $useStatements = new UseStatements([]);
+        $fqn = 'Inline\\Fully\\Qualified\\Name';
+        $name = new Name($fqn);
+
+        $this->assertEquals($fqn, $useStatements->fullyQualifiedNameFor($name));
+    }
 }
diff --git a/tests/unit/Code/Variables/TypeDeclarationTest.php b/tests/unit/Code/Variables/TypeDeclarationTest.php
index 435dd3d..3678ac0 100644
--- a/tests/unit/Code/Variables/TypeDeclarationTest.php
+++ b/tests/unit/Code/Variables/TypeDeclarationTest.php
@@ -104,13 +104,22 @@ function it_represents_to_string_union_types()
     /** @test */
     function it_extracts_reference_types_from_union_types()
     {
-        $unionType = TypeDeclaration::fromUnionType(['string', 'AClass', 'null', 'AnotherClass[]']);
+        $unionType = TypeDeclaration::fromUnionType(
+            [
+                'string',
+                'AClass',
+                'null',
+                'AnotherClass[]',
+                'Class\\With\\Namespace',
+            ]
+        );
 
         $references = $unionType->references();
 
-        $this->assertCount(2, $references);
+        $this->assertCount(3, $references);
         $this->assertEquals('AClass', (string) $references[1]);
         $this->assertEquals('AnotherClass', (string) $references[3]);
+        $this->assertEquals('Class\\With\\Namespace', $references[4]->fullName());
     }
 
     /** @test */