diff --git a/pkgs/tools/games/steamback/default.nix b/pkgs/tools/games/steamback/default.nix
index 662b6a06c6d8..6369d03760cc 100644
--- a/pkgs/tools/games/steamback/default.nix
+++ b/pkgs/tools/games/steamback/default.nix
@@ -45,6 +45,7 @@ buildPythonApplication rec {
     "async-tkinter-loop"
     "platformdirs"
     "Pillow"
+    "psutil"
   ];
 
   checkPhase = ''