diff --git a/src/noggit/MapChunk.cpp b/src/noggit/MapChunk.cpp
index 948231e9..7b40d3a6 100644
--- a/src/noggit/MapChunk.cpp
+++ b/src/noggit/MapChunk.cpp
@@ -1271,6 +1271,7 @@ int MapChunk::addTexture(scoped_blp_texture_reference texture)
 void MapChunk::switchTexture(scoped_blp_texture_reference const& oldTexture, scoped_blp_texture_reference newTexture)
 {
   texture_set->replace_texture(oldTexture, std::move (newTexture));
+  registerChunkUpdate(ChunkUpdateFlags::ALPHAMAP);
 }
 
 bool MapChunk::paintTexture(glm::vec3 const& pos, Brush* brush, float strength, float pressure, scoped_blp_texture_reference texture)