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-rw-r--r--nixos/lib/utils.nix3
1 files changed, 2 insertions, 1 deletions
diff --git a/nixos/lib/utils.nix b/nixos/lib/utils.nix
index 35c56e8c32b..7b8be2050c1 100644
--- a/nixos/lib/utils.nix
+++ b/nixos/lib/utils.nix
@@ -5,6 +5,7 @@ rec {
   # Escape a path according to the systemd rules, e.g. /dev/xyzzy
   # becomes dev-xyzzy.  FIXME: slow.
   escapeSystemdPath = s:
-   replaceChars ["/" "-" " "] ["-" "\\x2d" "\\x20"] (substring 1 (stringLength s) s);
+   replaceChars ["/" "-" " "] ["-" "\\x2d" "\\x20"]
+    (if hasPrefix "/" s then substring 1 (stringLength s) s else s);
 
 }