diff --git a/pkgs/applications/networking/instant-messengers/fluffychat/default.nix b/pkgs/applications/networking/instant-messengers/fluffychat/default.nix
index 99aef1526d54..565c44f72e92 100644
--- a/pkgs/applications/networking/instant-messengers/fluffychat/default.nix
+++ b/pkgs/applications/networking/instant-messengers/fluffychat/default.nix
@@ -25,7 +25,7 @@ flutter.mkFlutterApp rec {
     icon = "fluffychat";
     desktopName = "Fluffychat";
     genericName = "Chat with your friends (matrix client)";
-    categories = "Chat;Network;InstantMessaging;";
+    categories = [ "Chat" "Network" "InstantMessaging" ];
   };
 
   buildInputs = [
@@ -49,7 +49,7 @@ flutter.mkFlutterApp rec {
 
   # replace olm dummy path
   postConfigure = ''
-    M=$(echo $TMP/.pub-cache/hosted/pub.dartlang.org/matrix-*)
+    M=$(echo $depsFolder/.pub-cache/hosted/pub.dartlang.org/matrix-*)
     ln -sf ${olm}/lib/libolm.so.3 $M/ffi/olm/libolm.so
   '';