diff --git a/pkgs/tools/inputmethods/fcitx/fcitx-qt5.nix b/pkgs/tools/inputmethods/fcitx/fcitx-qt5.nix
index 428e96e8674d..ab139bdb5a76 100644
--- a/pkgs/tools/inputmethods/fcitx/fcitx-qt5.nix
+++ b/pkgs/tools/inputmethods/fcitx/fcitx-qt5.nix
@@ -13,7 +13,7 @@ stdenv.mkDerivation rec {
 
   preInstall = ''
     substituteInPlace platforminputcontext/cmake_install.cmake \
-      --replace ${qtbase} $out
+      --replace ${qtbase.out} $out
   '';
 
   meta = with stdenv.lib; {