diff --git a/nixos/modules/services/x11/xserver.nix b/nixos/modules/services/x11/xserver.nix
index 36f25d5547cae..38fb1074fcdf8 100644
--- a/nixos/modules/services/x11/xserver.nix
+++ b/nixos/modules/services/x11/xserver.nix
@@ -710,9 +710,9 @@ in
           '';
         }
       # Needed since 1.18; see https://bugs.freedesktop.org/show_bug.cgi?id=89023#c5
-      // (let cfgPath = "/X11/xorg.conf.d/10-evdev.conf"; in
+      // (let cfgPath = "X11/xorg.conf.d/10-evdev.conf"; in
         {
-          ${cfgPath}.source = xorg.xf86inputevdev.out + "/share" + cfgPath;
+          ${cfgPath}.source = xorg.xf86inputevdev.out + "/share/" + cfgPath;
         });
 
     environment.systemPackages = utils.removePackagesByName
diff --git a/nixos/modules/system/etc/build-composefs-dump.py b/nixos/modules/system/etc/build-composefs-dump.py
index 923d40008b63f..bf4ec791ecf7d 100644
--- a/nixos/modules/system/etc/build-composefs-dump.py
+++ b/nixos/modules/system/etc/build-composefs-dump.py
@@ -58,7 +58,7 @@ def __init__(
     ):
         if path is None:
             path = attrs["target"]
-        self.path = "/" + path
+        self.path = path
         self.size = size
         self.filetype = filetype
         self.mode = mode
@@ -83,8 +83,12 @@ def write_line(self) -> str:
         return " ".join(line_list)
 
 
-def eprint(*args, **kwargs) -> None:
-    print(args, **kwargs, file=sys.stderr)
+def eprint(*args: Any, **kwargs: Any) -> None:
+    print(*args, **kwargs, file=sys.stderr)
+
+
+def normalize_path(path: str) -> str:
+    return str("/" + os.path.normpath(path).lstrip("/"))
 
 
 def leading_directories(path: str) -> list[str]:
@@ -145,6 +149,10 @@ def main() -> None:
 
     paths: dict[str, ComposefsPath] = {}
     for attrs in config:
+        # Normalize the target path to work around issues in how targets are
+        # declared in `environment.etc`.
+        attrs["target"] = normalize_path(attrs["target"])
+
         target = attrs["target"]
         source = attrs["source"]
         mode = attrs["mode"]