diff --git a/tests/Composer/Test/Plugin/Fixtures/plugin-v1/Installer/Plugin.php b/tests/Composer/Test/Plugin/Fixtures/plugin-v1/Installer/Plugin.php
index 9196523e7..76c6cef09 100644
--- a/tests/Composer/Test/Plugin/Fixtures/plugin-v1/Installer/Plugin.php
+++ b/tests/Composer/Test/Plugin/Fixtures/plugin-v1/Installer/Plugin.php
@@ -9,7 +9,7 @@ class Plugin implements PluginInterface
 {
     public $version = 'installer-v1';
 
-    public function activate(Composer $composer)
+    public function activate()
     {
     }
 }
diff --git a/tests/Composer/Test/Plugin/Fixtures/plugin-v2/Installer/Plugin2.php b/tests/Composer/Test/Plugin/Fixtures/plugin-v2/Installer/Plugin2.php
index 5cea4f0d0..72e44a1b5 100644
--- a/tests/Composer/Test/Plugin/Fixtures/plugin-v2/Installer/Plugin2.php
+++ b/tests/Composer/Test/Plugin/Fixtures/plugin-v2/Installer/Plugin2.php
@@ -9,7 +9,7 @@ class Plugin2 implements PluginInterface
 {
     public $version = 'installer-v2';
 
-    public function activate(Composer $composer)
+    public function activate()
     {
     }
 }
diff --git a/tests/Composer/Test/Plugin/Fixtures/plugin-v3/Installer/Plugin2.php b/tests/Composer/Test/Plugin/Fixtures/plugin-v3/Installer/Plugin2.php
index 336618e57..e7130a1a6 100644
--- a/tests/Composer/Test/Plugin/Fixtures/plugin-v3/Installer/Plugin2.php
+++ b/tests/Composer/Test/Plugin/Fixtures/plugin-v3/Installer/Plugin2.php
@@ -9,7 +9,7 @@ class Plugin2 implements PluginInterface
 {
     public $version = 'installer-v3';
 
-    public function activate(Composer $composer)
+    public function activate()
     {
     }
 }
diff --git a/tests/Composer/Test/Plugin/Fixtures/plugin-v4/Installer/Plugin1.php b/tests/Composer/Test/Plugin/Fixtures/plugin-v4/Installer/Plugin1.php
index 9359d0f0e..826e5d52f 100644
--- a/tests/Composer/Test/Plugin/Fixtures/plugin-v4/Installer/Plugin1.php
+++ b/tests/Composer/Test/Plugin/Fixtures/plugin-v4/Installer/Plugin1.php
@@ -10,7 +10,7 @@ class Plugin1 implements PluginInterface
     public $name = 'plugin1';
     public $version = 'installer-v4';
 
-    public function activate(Composer $composer)
+    public function activate()
     {
     }
 }
diff --git a/tests/Composer/Test/Plugin/Fixtures/plugin-v4/Installer/Plugin2.php b/tests/Composer/Test/Plugin/Fixtures/plugin-v4/Installer/Plugin2.php
index b98b4f393..5716e3fae 100644
--- a/tests/Composer/Test/Plugin/Fixtures/plugin-v4/Installer/Plugin2.php
+++ b/tests/Composer/Test/Plugin/Fixtures/plugin-v4/Installer/Plugin2.php
@@ -10,7 +10,7 @@ class Plugin2 implements PluginInterface
     public $name = 'plugin2';
     public $version = 'installer-v4';
 
-    public function activate(Composer $composer)
+    public function activate()
     {
     }
 }