diff --git a/ecs.php b/ecs.php
index 3055939..89701b0 100644
--- a/ecs.php
+++ b/ecs.php
@@ -132,6 +132,7 @@
 use PhpCsFixer\Fixer\PhpUnit\PhpUnitDedicateAssertFixer;
 use PhpCsFixer\Fixer\PhpUnit\PhpUnitDedicateAssertInternalTypeFixer;
 use PhpCsFixer\Fixer\PhpUnit\PhpUnitExpectationFixer;
+use PhpCsFixer\Fixer\PhpUnit\PhpUnitFqcnAnnotationFixer;
 use PhpCsFixer\Fixer\PhpUnit\PhpUnitMockFixer;
 use PhpCsFixer\Fixer\PhpUnit\PhpUnitMockShortWillReturnFixer;
 use PhpCsFixer\Fixer\PhpUnit\PhpUnitNoExpectationAnnotationFixer;
@@ -390,6 +391,8 @@
             PhpUnitNoExpectationAnnotationFixer::class,
             // Usages of ->setExpectedException* methods MUST be replaced by ->expectException* methods
             PhpUnitExpectationFixer::class,
+            // PHPUnit annotations should be a FQCNs including a root namespace.
+            PhpUnitFqcnAnnotationFixer::class,
             // Visibility of setUp() and tearDown() method should be kept protected
             PhpUnitSetUpTearDownVisibilityFixer::class,
             // There should not be an empty `return` statement at the end of a function
diff --git a/tests/Integration/Fixtures/PhpUnit.correct.php.inc b/tests/Integration/Fixtures/PhpUnit.correct.php.inc
index bc52d30..46b3f92 100644
--- a/tests/Integration/Fixtures/PhpUnit.correct.php.inc
+++ b/tests/Integration/Fixtures/PhpUnit.correct.php.inc
@@ -4,6 +4,9 @@ namespace Lmc\CodingStandard\Integration\Fixtures;
 
 use PHPUnit\Framework\TestCase;
 
+/**
+ * @covers \Lmc\CodingStandard\Integration\Fixtures\MyClass
+ */
 class PhpUnit extends TestCase
 {
     // PhpUnitSetUpTearDownVisibilityFixer
diff --git a/tests/Integration/Fixtures/PhpUnit.wrong.php.inc b/tests/Integration/Fixtures/PhpUnit.wrong.php.inc
index 510e4bb..a9aefd7 100644
--- a/tests/Integration/Fixtures/PhpUnit.wrong.php.inc
+++ b/tests/Integration/Fixtures/PhpUnit.wrong.php.inc
@@ -4,6 +4,9 @@ namespace Lmc\CodingStandard\Integration\Fixtures;
 
 use PHPUnit\Framework\TestCase;
 
+/**
+ * @covers Lmc\CodingStandard\Integration\Fixtures\MyClass
+ */
 class PhpUnit extends TestCase
 {
     // PhpUnitSetUpTearDownVisibilityFixer