diff --git a/src/test/scala/view/AvatarImageProviderSpec.scala b/src/test/scala/view/AvatarImageProviderSpec.scala
index 4a00c4f..a331704 100644
--- a/src/test/scala/view/AvatarImageProviderSpec.scala
+++ b/src/test/scala/view/AvatarImageProviderSpec.scala
@@ -16,7 +16,7 @@
       val provider = new AvatarImageProviderImpl(Some(createAccount(None)))
 
       provider.toHtml("user", 20).toString mustEqual
-        "<img src=\"https://www.gravatar.com/avatar/d41d8cd98f00b204e9800998ecf8427e?s=20\" class=\"avatar\" style=\"width: 20px; height: 20px;\" />"
+        "<img src=\"https://www.gravatar.com/avatar/d41d8cd98f00b204e9800998ecf8427e?s=20&d=retro&r=g\" class=\"avatar\" style=\"width: 20px; height: 20px;\" />"
     }
 
     "show uploaded image even if gravatar integration is enabled" in {
@@ -40,7 +40,7 @@
       val provider = new AvatarImageProviderImpl(None)
 
       provider.toHtml("user", 20, "hoge@hoge.com").toString mustEqual
-        "<img src=\"https://www.gravatar.com/avatar/4712f9b0e63f56ad952ad387eaa23b9c?s=20\" class=\"avatar\" style=\"width: 20px; height: 20px;\" />"
+        "<img src=\"https://www.gravatar.com/avatar/4712f9b0e63f56ad952ad387eaa23b9c?s=20&d=retro&r=g\" class=\"avatar\" style=\"width: 20px; height: 20px;\" />"
     }
 
     "show unknown image for unknown user if gravatar integration is enabled" in {