diff --git a/pkgs/by-name/ca/catppuccin-fcitx5/package.nix b/pkgs/by-name/ca/catppuccin-fcitx5/package.nix
index bc719eb21095..93b0e4e660bd 100644
--- a/pkgs/by-name/ca/catppuccin-fcitx5/package.nix
+++ b/pkgs/by-name/ca/catppuccin-fcitx5/package.nix
@@ -24,7 +24,7 @@ stdenvNoCC.mkDerivation {
     runHook preInstall
   ''
   + lib.optionalString withRoundedCorners ''
-    find src -name theme.conf -exec sed -iE 's/^# (Image=(panel|highlight).svg)/\1/' {} +
+    find src -name theme.conf -exec sed -i -E 's/^# (Image=(panel|highlight).svg)/\1/' {} +
   ''
   + ''
     mkdir -p $out/share/fcitx5