diff --git a/src/loaih/build.py b/src/loaih/build.py
index 07256a0..2d79816 100644
--- a/src/loaih/build.py
+++ b/src/loaih/build.py
@@ -570,7 +570,7 @@ class Build():
 
                 # We download the missing dependencies leveraging apt
                 subprocess.run(shlex.split(
-                    r"apt download " + str.join(" " , debs)
+                    r"apt download " + " ".join(debs)
                 ), cwd=downloadpath, check=True)
 
                 # then we install them inside the AppDir