1 files changed, 1 insertions, 3 deletions
diff --git a/lib/arel/visitors/to_sql.rb b/lib/arel/visitors/to_sql.rb
index 710b6143ec..2ccc9d7d3f 100644
--- a/lib/arel/visitors/to_sql.rb
+++ b/lib/arel/visitors/to_sql.rb
@@ -179,9 +179,7 @@ module Arel
       end
 
       def visit_Arel_Nodes_Assignment o
-        right = o.right
-
-        right = right.nil? ? 'NULL' : visit(right)
+        right = quote(o.right, o.left.column)
         "#{visit o.left} = #{right}"
       end