diff --git a/pkgs/servers/calibre-web/default.nix b/pkgs/servers/calibre-web/default.nix
index f24a1f32f88..53db5f7ed0b 100644
--- a/pkgs/servers/calibre-web/default.nix
+++ b/pkgs/servers/calibre-web/default.nix
@@ -53,7 +53,6 @@ python3.pkgs.buildPythonApplication rec {
     iso-639
     pypdf2
     requests
-    singledispatch
     sqlalchemy
     tornado
     unidecode