diff --git a/pkgs/by-name/ca/calibre-web/package.nix b/pkgs/by-name/ca/calibre-web/package.nix
index c89c1a3307d3..a11ab1aeacf9 100644
--- a/pkgs/by-name/ca/calibre-web/package.nix
+++ b/pkgs/by-name/ca/calibre-web/package.nix
@@ -6,7 +6,6 @@
   nixosTests,
   python3Packages,
 }:
-
 python3Packages.buildPythonApplication rec {
   pname = "calibre-web";
   version = "0.6.24";
@@ -134,6 +133,7 @@ python3Packages.buildPythonApplication rec {
     "pypdf"
     "regex"
     "tornado"
+    "unidecode"
   ];
 
   nativeCheckInputs = lib.flatten (lib.attrValues optional-dependencies);