diff --git a/pkgs/applications/audio/mopidy/iris.nix b/pkgs/applications/audio/mopidy/iris.nix
index 796812a9bd0e..467ba6fe3f70 100644
--- a/pkgs/applications/audio/mopidy/iris.nix
+++ b/pkgs/applications/audio/mopidy/iris.nix
@@ -14,7 +14,7 @@ python3Packages.buildPythonApplication rec {
   ] ++ (with python3Packages; [
     configobj
     requests
-    tornado_4
+    tornado
   ]);
 
   # no tests implemented