diff --git a/cdist/conf/type/__apt_backports/manifest b/cdist/conf/type/__apt_backports/manifest
index c490a103..c2943725 100755
--- a/cdist/conf/type/__apt_backports/manifest
+++ b/cdist/conf/type/__apt_backports/manifest
@@ -28,7 +28,7 @@
 #  lsb_release may not be given in all installations
 codename_os_release() {
     # shellcheck disable=SC1090
-    . "$__global/explorer/os-release"
+    . "$__global/explorer/os_release"
     printf "%s" "$VERSION_CODENAME"
 }