diff --git a/lib/fup-repl.nix b/lib/fup-repl.nix
index 7db79c2..e636b6f 100644
--- a/lib/fup-repl.nix
+++ b/lib/fup-repl.nix
@@ -11,9 +11,9 @@ writeShellScriptBin "repl" ''
     ;;
     *)
       if [ -z "$1" ]; then
-        nix repl ${./repl.nix}
+        nix repl --file ${./repl.nix}
       else
-        nix repl --arg flakePath $(${coreutils}/bin/readlink -f $1 | ${gnused}/bin/sed 's|/flake.nix||') ${./repl.nix}
+        nix repl --arg flakePath $(${coreutils}/bin/readlink -f $1 | ${gnused}/bin/sed 's|/flake.nix||') --file ${./repl.nix}
       fi
     ;;
   esac
diff --git a/lib/repl.nix b/lib/repl.nix
index a46347a..9a1a098 100644
--- a/lib/repl.nix
+++ b/lib/repl.nix
@@ -5,7 +5,7 @@ let
 
   selfFlake =
     if pathExists registryPath
-    then filter (it: it.from.id == "self") (fromJSON (readFile registryPath)).flakes
+    then filter (it: it.from.id == "self") (fromJSON (builtins.unsafeDiscardStringContext (readFile registryPath))).flakes
     else [ ];
 
   flakePath' = toString
@@ -21,7 +21,7 @@ let
   nixpkgsFromInputsPath = flake.inputs.nixpkgs.outPath or "";
   nixpkgs = flake.pkgs.${currentSystem}.nixpkgs or (if nixpkgsFromInputsPath != "" then import nixpkgsFromInputsPath { } else { });
 
-  nixpkgsOutput = (removeAttrs (nixpkgs // nixpkgs.lib or { }) [ "options" "config" ]);
+  nixpkgsOutput = removeAttrs (nixpkgs // nixpkgs.lib or { }) [ "options" "config" ];
 in
 { inherit flake; }
 // flake