diff --git a/activerecord/lib/active_record/nested_attributes.rb b/activerecord/lib/active_record/nested_attributes.rb
index fb48459b6f..0c3392263a 100644
--- a/activerecord/lib/active_record/nested_attributes.rb
+++ b/activerecord/lib/active_record/nested_attributes.rb
@@ -323,7 +323,7 @@ def assign_nested_attributes_for_one_to_one_association(association_name, attrib
           (options[:update_only] || record.id.to_s == attributes['id'].to_s)
         assign_to_or_mark_for_destruction(record, attributes, options[:allow_destroy]) unless call_reject_if(association_name, attributes)
 
-      elsif !attributes['id'].blank?
+      elsif attributes['id'].present?
         raise_nested_attributes_record_not_found(association_name, attributes['id'])
 
       elsif !reject_new_record?(association_name, attributes)