diff --git a/src/app.py b/src/app.py
index c2d4d0a89..67e0617dd 100644
--- a/src/app.py
+++ b/src/app.py
@@ -62,6 +62,7 @@ from yunohost.utils.system import (
     dpkg_is_broken,
     get_ynh_package_version,
     system_arch,
+    debian_version,
     human_to_binary,
     binary_to_human,
     ram_available,
@@ -2854,6 +2855,7 @@ def _make_environment_for_app_script(
         "YNH_APP_MANIFEST_VERSION": manifest.get("version", "?"),
         "YNH_APP_PACKAGING_FORMAT": str(manifest["packaging_format"]),
         "YNH_ARCH": system_arch(),
+        "YNH_DEBIAN_VERSION": debian_version(),
     }
 
     if workdir:
diff --git a/src/utils/system.py b/src/utils/system.py
index 2538f74fb..a169bd62c 100644
--- a/src/utils/system.py
+++ b/src/utils/system.py
@@ -28,6 +28,10 @@ logger = logging.getLogger("yunohost.utils.packages")
 YUNOHOST_PACKAGES = ["yunohost", "yunohost-admin", "moulinette", "ssowat"]
 
 
+def debian_version():
+    return check_output('grep "^VERSION_CODENAME=" /etc/os-release | cut -d= -f2')
+
+
 def system_arch():
     return check_output("dpkg --print-architecture")