diff --git a/pkgs/development/python-modules/flask-principal/default.nix b/pkgs/development/python-modules/flask-principal/default.nix
index 1c185ce74770..8bf06c87d356 100644
--- a/pkgs/development/python-modules/flask-principal/default.nix
+++ b/pkgs/development/python-modules/flask-principal/default.nix
@@ -1,12 +1,13 @@
 { lib, buildPythonPackage, fetchPypi, flask, blinker, nose }:
 
 buildPythonPackage rec {
-  pname = "Flask-Principal";
+  pname = "flask-principal";
   version = "0.4.0";
 
   src = fetchPypi {
-    inherit pname version;
-    sha256 = "0lwlr5smz8vfm5h9a9i7da3q1c24xqc6vm9jdywdpgxfbi5i7mpm";
+    pname = "Flask-Principal";
+    inherit version;
+    hash = "sha256-9dYTS1yuv9u4bzLVbRjuRLCAh2onJpVgqW6jX3XJlFM=";
   };
 
   propagatedBuildInputs = [ flask blinker ];
diff --git a/pkgs/development/python-modules/flask-security-too/default.nix b/pkgs/development/python-modules/flask-security-too/default.nix
index c63b99161a98..743cc2902b97 100644
--- a/pkgs/development/python-modules/flask-security-too/default.nix
+++ b/pkgs/development/python-modules/flask-security-too/default.nix
@@ -27,7 +27,7 @@
 , email-validator
 , flask
 , flask-login
-, flask_principal
+, flask-principal
 , flask-wtf
 , itsdangerous
 , passlib
@@ -62,7 +62,7 @@ buildPythonPackage rec {
     email-validator
     flask
     flask-login
-    flask_principal
+    flask-principal
     flask-wtf
     itsdangerous
     passlib
diff --git a/pkgs/servers/calibre-web/default.nix b/pkgs/servers/calibre-web/default.nix
index 8ba198873f5a..607ced4606ff 100644
--- a/pkgs/servers/calibre-web/default.nix
+++ b/pkgs/servers/calibre-web/default.nix
@@ -40,7 +40,7 @@ python.pkgs.buildPythonApplication rec {
     chardet
     flask-babel
     flask-login
-    flask_principal
+    flask-principal
     flask-wtf
     flask-limiter
     iso-639
diff --git a/pkgs/top-level/python-aliases.nix b/pkgs/top-level/python-aliases.nix
index ed1a359762a9..c5301f107977 100644
--- a/pkgs/top-level/python-aliases.nix
+++ b/pkgs/top-level/python-aliases.nix
@@ -137,6 +137,7 @@ mapAliases ({
   flask_mail = flask-mail; # added 2023-08-23
   flask_marshmallow = flask-marshmallow; # added 2023-08-16
   flask_migrate = flask-migrate; # added 2023-08-23
+  flask_principal = flask-principal; # added 2023-08-23
   flask-restplus = throw "flask-restplus is no longer maintained, use flask-restx instead"; # added 2023-02-21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 6ec661a210a0..914465b89f81 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -3847,7 +3847,7 @@ self: super: with self; {
 
   flask-paranoid = callPackage ../development/python-modules/flask-paranoid { };
 
-  flask_principal = callPackage ../development/python-modules/flask-principal { };
+  flask-principal = callPackage ../development/python-modules/flask-principal { };
 
   flask-pymongo = callPackage ../development/python-modules/Flask-PyMongo { };