diff --git a/library/modules/Buildings.cpp b/library/modules/Buildings.cpp
index 58c1a87f9..cc4af8d95 100644
--- a/library/modules/Buildings.cpp
+++ b/library/modules/Buildings.cpp
@@ -73,6 +73,7 @@ using namespace DFHack;
 #include "df/building_water_wheelst.h"
 #include "df/building_wellst.h"
 #include "df/building_rollersst.h"
+#include "df/building_floodgatest.h"
 
 using namespace df::enums;
 using df::global::ui;
@@ -369,6 +370,12 @@ df::building *Buildings::allocInstance(df::coord pos, df::building_type type, in
                 obj->ready_timeout = 500;
             break;
         }
+    case building_type::Floodgate:
+        {
+            auto obj = (df::building_floodgatest*)bld;
+            obj->gate_flags.bits.closed = true;
+            break;
+        }
     default:
         break;
     }