diff --git a/tools/ddw3-mkrlen/src/args.rs b/tools/ddw3-mkrlen/src/args.rs
index d77302a9f..fd100a8a2 100644
--- a/tools/ddw3-mkrlen/src/args.rs
+++ b/tools/ddw3-mkrlen/src/args.rs
@@ -17,7 +17,7 @@ pub struct Args {
 
 	/// Run in compatibility mode for file.
 	///
-	/// Expects a string of format `<map>.<map-part>`,
+	/// Expects a string of format `<map>.<tile>`,
 	/// for example, `S232.12`
 	#[clap(long = "compatibility")]
 	pub compatibility: Option<String>,
diff --git a/tools/ddw3-mkrlen/src/main.rs b/tools/ddw3-mkrlen/src/main.rs
index a3eabf783..894e2c586 100644
--- a/tools/ddw3-mkrlen/src/main.rs
+++ b/tools/ddw3-mkrlen/src/main.rs
@@ -47,8 +47,8 @@ fn main() -> Result<(), anyhow::Error> {
 
 			try {
 				let map = args.input.parent()?.file_name()?.to_str()?.strip_suffix("PACK")?;
-				let map_part = args.input.file_prefix()?.to_str()?;
-				let compatibility = format!("{map}.{map_part}");
+				let tile = args.input.file_prefix()?.to_str()?;
+				let compatibility = format!("{map}.{tile}");
 
 				tracing::info!(?compatibility, "Found auto-compatibility");
 				compatibility