diff --git a/pkgs/top-level/python-aliases.nix b/pkgs/top-level/python-aliases.nix
index 7f6d7e44ac68..adb9851f5887 100644
--- a/pkgs/top-level/python-aliases.nix
+++ b/pkgs/top-level/python-aliases.nix
@@ -131,6 +131,7 @@ mapAliases ({
   filemagic = throw "inactive since 2014, so use python-magic instead"; # added 2022-11-19
   flaskbabel = flask-babel; # added 2023-01-19
   flask_login = flask-login; # added 2022-10-17
+  flask_marshmallow = flask-marshmallow; # added 2023-08-16
   flask-restplus = throw "flask-restplus is no longer maintained, use flask-restx instead"; # added 2023-02-21
   flask_sqlalchemy = flask-sqlalchemy; # added 2022-07-20
   flask_testing = flask-testing; # added 2022-04-25
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index 1dab3acea718..3d8116d33a7b 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -3822,7 +3822,7 @@ self: super: with self; {
 
   flask-mailman = callPackage ../development/python-modules/flask-mailman { };
 
-  flask_marshmallow = callPackage ../development/python-modules/flask-marshmallow { };
+  flask-marshmallow = callPackage ../development/python-modules/flask-marshmallow { };
 
   flask_migrate = callPackage ../development/python-modules/flask-migrate { };