diff --git a/pkgs/by-name/ca/calibre-web/package.nix b/pkgs/by-name/ca/calibre-web/package.nix
index 397b9e76cfc4..c3f125261ca8 100644
--- a/pkgs/by-name/ca/calibre-web/package.nix
+++ b/pkgs/by-name/ca/calibre-web/package.nix
@@ -35,6 +35,7 @@ python.pkgs.buildPythonApplication rec {
     flask-limiter
     flask-login
     flask-principal
+    flask-simpleldap
     flask-wtf
     iso-639
     jsonschema