diff --git a/lib/philomena/images/image.ex b/lib/philomena/images/image.ex
index d8e791c8..7b808eaa 100644
--- a/lib/philomena/images/image.ex
+++ b/lib/philomena/images/image.ex
@@ -212,11 +212,13 @@ defmodule Philomena.Images.Image do
     image
     |> cast(attrs, [])
     |> SourceDiffer.diff_input(old_sources, new_sources)
+    |> validate_length(:sources, max: 15)
   end
 
   def sources_changeset(image, new_sources) do
     change(image)
     |> put_assoc(:sources, new_sources)
+    |> validate_length(:sources, max: 15)
   end
 
   def tag_changeset(image, attrs, old_tags, new_tags, excluded_tags \\ []) do