diff --git a/pkgs/os-specific/linux/ldm/default.nix b/pkgs/os-specific/linux/ldm/default.nix
index c5e94ed81e9a..a32d815ac2f0 100644
--- a/pkgs/os-specific/linux/ldm/default.nix
+++ b/pkgs/os-specific/linux/ldm/default.nix
@@ -19,9 +19,10 @@ stdenv.mkDerivation rec {
 
   buildInputs = [ udev utillinux ];
 
-  preBuild = ''
+  postPatch = ''
     substituteInPlace ldm.c \
       --replace "/mnt/" "${mountPath}"
+    sed '16i#include <sys/stat.h>' -i ldm.c
   '';
 
   buildPhase = "make ldm";