diff --git a/app/models/enterprise.rb b/app/models/enterprise.rb
index dfb7945878..b5a89339ac 100644
--- a/app/models/enterprise.rb
+++ b/app/models/enterprise.rb
@@ -34,7 +34,7 @@ class Enterprise < ActiveRecord::Base
     path: 'public/images/enterprises/logos/:id/:style/:basename.:extension'
 
   has_attached_file :promo_image,
-    styles: { large: "1200x260#", medium: "720x156#",  thumb: "100x100>" },
+    styles: { large: ["1200x260#", :jpg], medium: ["720x156#", :jpg],  thumb: ["100x100>", :jpg] },
     url:  '/images/enterprises/promo_images/:id/:style/:basename.:extension',
     path: 'public/images/enterprises/promo_images/:id/:style/:basename.:extension'
 
diff --git a/app/models/enterprise_group.rb b/app/models/enterprise_group.rb
index cdc9d9932a..6e61b1a564 100644
--- a/app/models/enterprise_group.rb
+++ b/app/models/enterprise_group.rb
@@ -15,7 +15,7 @@ class EnterpriseGroup < ActiveRecord::Base
     path: 'public/images/enterprise_groups/logos/:id/:style/:basename.:extension'
 
   has_attached_file :promo_image,
-    styles: {large: "1200x260#"},
+    styles: {large: ["1200x260#", :jpg]},
     url:  '/images/enterprise_groups/promo_images/:id/:style/:basename.:extension',
     path: 'public/images/enterprise_groups/promo_images/:id/:style/:basename.:extension'