diff --git a/pkgs/applications/misc/calibre/default.nix b/pkgs/applications/misc/calibre/default.nix
index 5d57ff9a5b69..f7e984620413 100644
--- a/pkgs/applications/misc/calibre/default.nix
+++ b/pkgs/applications/misc/calibre/default.nix
@@ -86,6 +86,7 @@ mkDerivation rec {
     with python3Packages; [
       apsw
       beautifulsoup4
+      cchardet
       css-parser
       cssselect
       dateutil