diff --git a/Content.Shared/Tiles/ProtectedGridSystem.cs b/Content.Shared/Tiles/ProtectedGridSystem.cs
index 0d6f5b7a6d..f90b0a52de 100644
--- a/Content.Shared/Tiles/ProtectedGridSystem.cs
+++ b/Content.Shared/Tiles/ProtectedGridSystem.cs
@@ -62,7 +62,7 @@ public sealed class ProtectedGridSystem : EntitySystem
             return;
         }
 
-        if (SharedMapSystem.FromBitmask(args.GridIndices, data))
+        if (!SharedMapSystem.FromBitmask(args.GridIndices, data))
         {
             args.Cancelled = true;
         }