diff --git a/src/main.rs b/src/main.rs
index 933e250..48feeb9 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -264,20 +264,20 @@ fn monitor_chip(_args: ArgMonitor, target: &mut PhysicalTarget) -> Result<(), Er
 }
 
 fn run_chip(args: ArgRun, target: &mut PhysicalTarget) -> Result<(), Error> {
-	let parent_path = args.path.parent().unwrap().join("tulflash");
-	let base_file = parent_path.join(
-		args.path.file_name().ok_or(Error::other("invalid path to compilation source"))?);
-	let path = base_file.with_extension("ihx");
-	let sdcc_file = args.path.file_name().ok_or(Error::other("invalid path to compilation source"))?;
-	let cmd = Some(OsString::from(
-        format!("sdcc \"{}\"", sdcc_file.to_str().ok_or(Error::other("invalid path to compilation source"))?)
-	));
-	let cmd_path = Some(parent_path.clone());
-	std::fs::create_dir_all(parent_path)?;
-	std::fs::copy(args.path, &base_file)?;
+	let build_dir = args.path.parent().unwrap().join("tulflash");
+
+	let source_file_name = args.path.file_name().ok_or(Error::other("invalid path to compilation source"))?;
+	let source_file = build_dir.join(&source_file_name);
+	let output_file = source_file.with_extension("ihx");
+
+	let cmd = Some(OsString::from(format!("sdcc \"{}\"", source_file_name.to_string_lossy())));
+	let cmd_path = Some(build_dir.clone());
+
+	std::fs::create_dir_all(build_dir)?;
+	std::fs::copy(args.path, &source_file)?;
 
 	write_chip(ArgWrite {
-		path: path.into_os_string(),
+		path: output_file.into_os_string(),
 		cmd_path,
 		cmd,
 		start: 0,