diff --git a/Source/gendung.h b/Source/gendung.h
index a3cf657cf..81a3ff448 100644
--- a/Source/gendung.h
+++ b/Source/gendung.h
@@ -154,7 +154,7 @@ extern std::unique_ptr<byte[]> pDungeonCels;
 /**
  * List tile properties
  */
-extern std::array<TileProperties, MAXTILES> SOLData;
+extern DVL_API_FOR_TEST std::array<TileProperties, MAXTILES> SOLData;
 /** Specifies the minimum X,Y-coordinates of the map. */
 extern Point dminPosition;
 /** Specifies the maximum X,Y-coordinates of the map. */