diff --git a/pkgs/tools/networking/nfstrace/default.nix b/pkgs/tools/networking/nfstrace/default.nix
index ac9af8e9816..7e2b938e4c8 100644
--- a/pkgs/tools/networking/nfstrace/default.nix
+++ b/pkgs/tools/networking/nfstrace/default.nix
@@ -33,10 +33,9 @@ stdenv.mkDerivation rec {
   ];
 
   postPatch = ''
+   # -Wall -Wextra -Werror fails on clang and newer gcc
     substituteInPlace CMakeLists.txt \
-      --replace "-Wno-braced-scalar-init" ""
-    # -Wall -Wextra -Werror fails on clang and newer gcc
-    substituteInPlace CMakeLists.txt \
+      --replace "-Wno-braced-scalar-init" "" \
       --replace "-Werror" ""
   '';