diff --git a/xtask/src/tbuld.rs b/xtask/src/tbuld.rs
index 539913f8..bcb9a555 100644
--- a/xtask/src/tbuld.rs
+++ b/xtask/src/tbuld.rs
@@ -78,11 +78,10 @@ impl Context {
         }
 
         if !vm_config_paths.is_empty() {
-            let value = vm_config_paths
-                .iter()
-                .map(|p| format!("{}", p.display()))
-                .collect::<Vec<_>>()
-                .join(";");
+            let value = std::env::join_paths(&vm_config_paths)
+                .map_err(|e| anyhow::anyhow!("Failed to join VM config paths: {}", e))?
+                .to_string_lossy()
+                .into_owned();
             cargo.env.insert("AXVISOR_VM_CONFIGS".to_string(), value);
         }