diff --git a/src/core/common.rs b/src/core/common.rs
index d17056f..49c8301 100644
--- a/src/core/common.rs
+++ b/src/core/common.rs
@@ -31,6 +31,11 @@ pub const MAP_FILE_META_VERSION: FileMetaVersion = FileMetaVersion(0);
 /// (usually because of updated resource data)
 pub const LIGHTMAP_FILE_META_VERSION: FileMetaVersion = FileMetaVersion(0);
 
+/// MinedMap mipmap data version number
+///
+/// Increase when the mipmap generation changes (this should not happen)
+pub const MIPMAP_FILE_META_VERSION: FileMetaVersion = FileMetaVersion(0);
+
 /// Coordinate pair of a generated tile
 ///
 /// Each tile corresponds to one Minecraft region file
diff --git a/src/core/tile_mipmapper.rs b/src/core/tile_mipmapper.rs
index 355bd23..6ea8750 100644
--- a/src/core/tile_mipmapper.rs
+++ b/src/core/tile_mipmapper.rs
@@ -70,12 +70,8 @@ impl<'a> TileMipmapper<'a> {
 		/// Tile width/height
 		const N: u32 = (BLOCKS_PER_CHUNK * CHUNKS_PER_REGION) as u32;
 
-		let version = match kind {
-			TileKind::Map => REGION_FILE_META_VERSION,
-			TileKind::Lightmap => LIGHTMAP_FILE_META_VERSION,
-		};
 		let output_path = self.config.tile_path(kind, level, coords);
-		let output_timestamp = fs::read_timestamp(&output_path, version);
+		let output_timestamp = fs::read_timestamp(&output_path, MIPMAP_FILE_META_VERSION);
 
 		let sources: Vec<_> = [(0, 0), (0, 1), (1, 0), (1, 1)]
 			.into_iter()
@@ -149,11 +145,16 @@ impl<'a> TileMipmapper<'a> {
 			);
 		}
 
-		fs::create_with_timestamp(&output_path, version, input_timestamp, |file| {
-			image
-				.write_to(file, image::ImageFormat::Png)
-				.context("Failed to save image")
-		})?;
+		fs::create_with_timestamp(
+			&output_path,
+			MIPMAP_FILE_META_VERSION,
+			input_timestamp,
+			|file| {
+				image
+					.write_to(file, image::ImageFormat::Png)
+					.context("Failed to save image")
+			},
+		)?;
 
 		count_processed.send(()).unwrap();
 		Ok(())