diff --git a/src/Factories/Attributes/Covers.php b/src/Factories/Attributes/Covers.php
index 67cf44ad..1d0e6991 100644
--- a/src/Factories/Attributes/Covers.php
+++ b/src/Factories/Attributes/Covers.php
@@ -32,6 +32,11 @@ final class Covers extends Attribute
     {
         foreach ($method->covers as $covering) {
             if ($covering instanceof CoversClass) {
+                // Prepend a backslash for FQN classes
+                if (str_contains($covering->class, '\\')) {
+                    $covering->class = '\\' . $covering->class;
+                }
+
                 $attributes[] = "#[\PHPUnit\Framework\Attributes\CoversClass({$covering->class}::class)]";
             } else if ($covering instanceof CoversFunction) {
                 $attributes[] = "#[\PHPUnit\Framework\Attributes\CoversFunction('{$covering->function}')]";
diff --git a/src/Factories/TestCaseFactory.php b/src/Factories/TestCaseFactory.php
index d568ee3e..2fb6d429 100644
--- a/src/Factories/TestCaseFactory.php
+++ b/src/Factories/TestCaseFactory.php
@@ -166,7 +166,7 @@ final class TestCaseFactory
         }
 
         $classAttributes = implode('', array_map(
-            static fn ($attribute) => sprintf("\n                 %s", $attribute),
+            static fn (string $attribute) => sprintf("\n                 %s", $attribute),
             array_unique($classAttributes),
         ));