diff --git a/app/models/document_category.rb b/app/models/document_category.rb
index 4bfbba4..c84d27e 100644
--- a/app/models/document_category.rb
+++ b/app/models/document_category.rb
@@ -29,7 +29,7 @@ class DocumentCategory < Enumeration
   end
 
   def transfer_relations(to)
-    documents.update_all("category_id = #{to.id}")
+    documents.update_all(:category_id => to.id)
   end
 
   def self.default
diff --git a/app/models/issue_priority.rb b/app/models/issue_priority.rb
index 182235c..1e00cc0 100644
--- a/app/models/issue_priority.rb
+++ b/app/models/issue_priority.rb
@@ -32,7 +32,7 @@ class IssuePriority < Enumeration
   end
 
   def transfer_relations(to)
-    issues.update_all("priority_id = #{to.id}")
+    issues.update_all(:priority_id => to.id)
   end
 
   def css_classes