diff --git a/src/Eccube/Service/Composer/ComposerProcessService.php b/src/Eccube/Service/Composer/ComposerProcessService.php
index fdeece5b163..e409b545704 100644
--- a/src/Eccube/Service/Composer/ComposerProcessService.php
+++ b/src/Eccube/Service/Composer/ComposerProcessService.php
@@ -141,11 +141,11 @@ public function execConfig($key, $value = null)
 
     public function configureRepository(BaseInfo $BaseInfo)
     {
-        return $this->composerApiService->configureRepository($BaseInfo);
+        $this->composerApiService->configureRepository($BaseInfo);
     }
 
     public function foreachRequires($packageName, $version, $callback, $typeFilter = null, $level = 0)
     {
-        return $this->composerApiService->foreachRequires($packageName, $version, $callback, $typeFilter, $level);
+        $this->composerApiService->foreachRequires($packageName, $version, $callback, $typeFilter, $level);
     }
 }
diff --git a/tests/Eccube/Tests/Service/PluginServiceTest.php b/tests/Eccube/Tests/Service/PluginServiceTest.php
index 757ab1c9ccd..410830d4dae 100644
--- a/tests/Eccube/Tests/Service/PluginServiceTest.php
+++ b/tests/Eccube/Tests/Service/PluginServiceTest.php
@@ -100,7 +100,7 @@ public function deleteFile($path)
     {
         $f = new Filesystem();
 
-        return $f->remove($path);
+        $f->remove($path);
     }
 
     // 必要最小限のファイルのプラグインのインストールとアンインストールを検証
diff --git a/tests/Eccube/Tests/Service/PluginServiceWithEntityExtensionTest.php b/tests/Eccube/Tests/Service/PluginServiceWithEntityExtensionTest.php
index c86c88fffaa..e55a241c724 100644
--- a/tests/Eccube/Tests/Service/PluginServiceWithEntityExtensionTest.php
+++ b/tests/Eccube/Tests/Service/PluginServiceWithEntityExtensionTest.php
@@ -90,7 +90,7 @@ public function deleteFile($path)
     {
         $f = new Filesystem();
 
-        return $f->remove($path);
+        $f->remove($path);
     }
 
     /**