diff --git a/pkgs/by-name/sh/shadow/package.nix b/pkgs/by-name/sh/shadow/package.nix
index cc5a36f5afbd..58cc701e9efc 100644
--- a/pkgs/by-name/sh/shadow/package.nix
+++ b/pkgs/by-name/sh/shadow/package.nix
@@ -22,7 +22,7 @@
   tcb,
 }:
 let
-  glibc =
+  glibc' =
     if stdenv.hostPlatform != stdenv.buildPlatform then
       glibc
     else
@@ -100,7 +100,7 @@ stdenv.mkDerivation rec {
     ++ lib.optional withTcb "--with-tcb";
 
   preBuild = lib.optionalString (stdenv.hostPlatform.libc == "glibc") ''
-    substituteInPlace lib/nscd.c --replace /usr/sbin/nscd ${glibc.bin}/bin/nscd
+    substituteInPlace lib/nscd.c --replace /usr/sbin/nscd ${glibc'.bin}/bin/nscd
   '';
 
   postInstall = ''