diff --git a/pkgs/servers/calibre-web/default.nix b/pkgs/servers/calibre-web/default.nix
index 91a5e4fdd1c5..50198b392797 100644
--- a/pkgs/servers/calibre-web/default.nix
+++ b/pkgs/servers/calibre-web/default.nix
@@ -21,7 +21,7 @@ python3.pkgs.buildPythonApplication rec {
     backports_abc
     chardet
     flask-babel
-    flask_login
+    flask-login
     flask_principal
     flask-wtf
     iso-639