diff --git a/pkgs/os-specific/linux/fatrace/default.nix b/pkgs/os-specific/linux/fatrace/default.nix
index 09da891a175..f68856f6b86 100644
--- a/pkgs/os-specific/linux/fatrace/default.nix
+++ b/pkgs/os-specific/linux/fatrace/default.nix
@@ -14,6 +14,9 @@ stdenv.mkDerivation rec {
   postPatch = ''
     substituteInPlace power-usage-report \
       --replace "'which'" "'${which}/bin/which'"
+
+    # Avoid a glibc >= 2.25 deprecation warning that gets fatal via -Werror.
+    sed 1i'#include <sys/sysmacros.h>' -i fatrace.c
   '';
 
   makeFlags = [ "PREFIX=$(out)" ];