diff --git a/Source/levels/gendung.cpp b/Source/levels/gendung.cpp
index 3e1a69ff6..3ecd44902 100644
--- a/Source/levels/gendung.cpp
+++ b/Source/levels/gendung.cpp
@@ -422,6 +422,7 @@ void LoadLevelSOLData()
 		break;
 	case DTYPE_CATHEDRAL:
 		LoadFileInMem("levels\\l1data\\l1.sol", SOLData);
+		SOLData[27] |= TileProperties::BlockMissile; // Tile is incorrectly marked
 		break;
 	case DTYPE_CATACOMBS:
 		LoadFileInMem("levels\\l2data\\l2.sol", SOLData);