diff --git a/pkgs/by-name/fc/fcitx5-mcbopomofo/package.nix b/pkgs/by-name/fc/fcitx5-mcbopomofo/package.nix
index 698329d15ec2..e5b499f20f8a 100644
--- a/pkgs/by-name/fc/fcitx5-mcbopomofo/package.nix
+++ b/pkgs/by-name/fc/fcitx5-mcbopomofo/package.nix
@@ -28,16 +28,19 @@ stdenv.mkDerivation rec {
     cmake
     extra-cmake-modules
     gettext
-    json_c
-    icu
-    fmt
     gtest
   ];
 
   buildInputs = [
     fcitx5
+    fmt
+    gtest
+    icu
+    json_c
   ];
 
+  strictDeps = true;
+
   cmakeFlags = [
     "-DCMAKE_BUILD_TYPE=Release"
   ];