1 files changed, 2 insertions, 2 deletions
diff --git a/pkgs/applications/networking/browsers/mullvad-browser/default.nix b/pkgs/applications/networking/browsers/mullvad-browser/default.nix
index 9edb3d882acb3..a34b5022a7a39 100644
--- a/pkgs/applications/networking/browsers/mullvad-browser/default.nix
+++ b/pkgs/applications/networking/browsers/mullvad-browser/default.nix
@@ -208,8 +208,8 @@ stdenv.mkDerivation rec {
     # fonts.conf; upstream uses FONTCONFIG_PATH, but FC_DEBUG=1024
     # indicates the system fonts.conf being used instead.
     FONTCONFIG_FILE=$MB_IN_STORE/fontconfig/fonts.conf
-    sed -i "$FONTCONFIG_FILE" \
-      -e "s,<dir>fonts</dir>,<dir>$MB_IN_STORE/fonts</dir>,"
+    substituteInPlace "$FONTCONFIG_FILE" \
+      --replace-fail '<dir prefix="cwd">fonts</dir>' "<dir>$MB_IN_STORE/fonts</dir>"
 
     mkdir -p $out/bin