diff --git a/src/all_building_blocks/wait_blocks.jl b/src/all_building_blocks/wait_blocks.jl
index c83d6a22de03cf56cf9b6ce5944c2df2492993c2..004c5fb1cb52c55519436f0d4c6ab415a35d2412 100644
--- a/src/all_building_blocks/wait_blocks.jl
+++ b/src/all_building_blocks/wait_blocks.jl
@@ -12,6 +12,7 @@ struct Wait <: BaseBuildingBlock
         if !(res.duration isa Number)
             @constraint global_model() res.duration >= 0
         end
+        return res
     end
 end