diff --git a/plugins/autolabor.cpp b/plugins/autolabor.cpp
index 21cd299ee..8531e09c8 100644
--- a/plugins/autolabor.cpp
+++ b/plugins/autolabor.cpp
@@ -775,6 +775,7 @@ private:
             case df::building_type::Construction:
             case df::building_type::Bridge:
             case df::building_type::ArcheryTarget:
+            case df::building_type::WaterWheel:
                 {
                     df::building_actual* b = (df::building_actual*) bld;
                     if (b->design && !b->design->flags.bits.designed)