diff --git a/app/models/section.rb b/app/models/section.rb
index 42cb330..2aef5b1 100644
--- a/app/models/section.rb
+++ b/app/models/section.rb
@@ -129,6 +129,6 @@
 
   def set_number
     return if phase.nil?
-    self.number ||= phase.sections.maximum(:number) + 1
+    self.number ||= phase.sections.maximum(:number).to_i + 1
   end
 end