diff --git a/pkgs/development/python-modules/async_timeout/default.nix b/pkgs/development/python-modules/async-timeout/default.nix
similarity index 86%
rename from pkgs/development/python-modules/async_timeout/default.nix
rename to pkgs/development/python-modules/async-timeout/default.nix
index 2a67ed1d6710..55297bea9cbd 100644
--- a/pkgs/development/python-modules/async_timeout/default.nix
+++ b/pkgs/development/python-modules/async-timeout/default.nix
@@ -13,7 +13,7 @@ buildPythonPackage rec {
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "2163e1640ddb52b7a8c80d0a67a08587e5d245cc9c553a74a847056bc2976b15";
+    hash = "sha256-IWPhZA3bUreoyA0KZ6CFh+XSRcycVTp0qEcFa8KXaxU=";
   };
 
   propagatedBuildInputs = [
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index e2a8abab4c55..86a9b128db7e 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -776,7 +776,7 @@ self: super: with self; {
 
   asynctest = callPackage ../development/python-modules/asynctest { };
 
-  async-timeout = callPackage ../development/python-modules/async_timeout { };
+  async-timeout = callPackage ../development/python-modules/async-timeout { };
 
   async-tkinter-loop = callPackage ../development/python-modules/async-tkinter-loop { };