diff --git a/lib/philomena/image_faves/image_fave.ex b/lib/philomena/image_faves/image_fave.ex
index 50b7b49a..cb99472d 100644
--- a/lib/philomena/image_faves/image_fave.ex
+++ b/lib/philomena/image_faves/image_fave.ex
@@ -18,5 +18,6 @@ defmodule Philomena.ImageFaves.ImageFave do
     image_fave
     |> cast(attrs, [])
     |> validate_required([])
+    |> unique_constraint([:image_id, :user_id], name: :index_image_faves_on_image_id_and_user_id)
   end
 end
diff --git a/lib/philomena/image_hides/image_hide.ex b/lib/philomena/image_hides/image_hide.ex
index bc52bb8d..e60d12d5 100644
--- a/lib/philomena/image_hides/image_hide.ex
+++ b/lib/philomena/image_hides/image_hide.ex
@@ -18,5 +18,6 @@ defmodule Philomena.ImageHides.ImageHide do
     image_hide
     |> cast(attrs, [])
     |> validate_required([])
+    |> unique_constraint([:image_id, :user_id], name: :index_image_hides_on_image_id_and_user_id)
   end
 end
diff --git a/lib/philomena/image_votes/image_vote.ex b/lib/philomena/image_votes/image_vote.ex
index d3dd1689..eeb8c953 100644
--- a/lib/philomena/image_votes/image_vote.ex
+++ b/lib/philomena/image_votes/image_vote.ex
@@ -19,5 +19,6 @@ defmodule Philomena.ImageVotes.ImageVote do
     image_vote
     |> cast(attrs, [])
     |> validate_required([])
+    |> unique_constraint([:image_id, :user_id], name: :index_image_votes_on_image_id_and_user_id)
   end
 end