diff --git a/pkgs/applications/science/misc/snakemake/default.nix b/pkgs/applications/science/misc/snakemake/default.nix
index b2afc4701a5..0818ca79622 100644
--- a/pkgs/applications/science/misc/snakemake/default.nix
+++ b/pkgs/applications/science/misc/snakemake/default.nix
@@ -18,7 +18,7 @@ python3Packages.buildPythonApplication rec {
     pyyaml
     ratelimiter
     requests
-    smart_open
+    smart-open
     toposort
     wrapt
   ];
diff --git a/pkgs/development/python-modules/gensim/default.nix b/pkgs/development/python-modules/gensim/default.nix
index b6b6f42b3c3..b29822a507c 100644
--- a/pkgs/development/python-modules/gensim/default.nix
+++ b/pkgs/development/python-modules/gensim/default.nix
@@ -4,7 +4,7 @@
 , numpy
 , six
 , scipy
-, smart_open
+, smart-open
 , scikit-learn, testfixtures, unittest2
 , isPy3k
 }:
@@ -19,7 +19,7 @@ buildPythonPackage rec {
     sha256 = "0rx37vnjspjl45v7bj123xwsjfgbwv91v8zpqpli8lgpf42xnskq";
   };
 
-  propagatedBuildInputs = [ smart_open numpy six scipy ];
+  propagatedBuildInputs = [ smart-open numpy six scipy ];
 
   checkInputs = [ scikit-learn testfixtures unittest2 ];
 
diff --git a/pkgs/development/python-modules/pathy/default.nix b/pkgs/development/python-modules/pathy/default.nix
index 714e6945df5..d656a752cf5 100644
--- a/pkgs/development/python-modules/pathy/default.nix
+++ b/pkgs/development/python-modules/pathy/default.nix
@@ -4,7 +4,7 @@
 , pytestCheckHook
 , typer
 , dataclasses
-, smart_open
+, smart-open
 , pytest
 , mock
 , google-cloud-storage
@@ -19,7 +19,7 @@ buildPythonPackage rec {
     sha256 = "sha256-nb8my/5rkc7thuHnXZHe1Hg8j+sLBlYyJcLHWrrKZ5M=";
   };
 
-  propagatedBuildInputs = [ smart_open typer google-cloud-storage ];
+  propagatedBuildInputs = [ smart-open typer google-cloud-storage ];
 
   postPatch = ''
     substituteInPlace requirements.txt \
diff --git a/pkgs/development/python-modules/smart_open/default.nix b/pkgs/development/python-modules/smart-open/default.nix
similarity index 80%
rename from pkgs/development/python-modules/smart_open/default.nix
rename to pkgs/development/python-modules/smart-open/default.nix
index 4f3423b7df3..051d6c97397 100644
--- a/pkgs/development/python-modules/smart_open/default.nix
+++ b/pkgs/development/python-modules/smart-open/default.nix
@@ -12,12 +12,13 @@
 }:
 
 buildPythonPackage rec {
-  pname = "smart_open";
+  pname = "smart-open";
   version = "4.2.0";
   disabled = pythonOlder "3.5";
 
   src = fetchPypi {
-    inherit pname version;
+    pname = "smart_open";
+    inherit version;
     sha256 = "d9f5a0f173ccb9bbae528db5a3804f57145815774f77ef755b9b0f3b4b2a9dcb";
   };
 
@@ -29,9 +30,10 @@ buildPythonPackage rec {
 
   # upstream code requires both boto and boto3
   propagatedBuildInputs = [ boto boto3 bz2file requests ];
+
   meta = {
     license = lib.licenses.mit;
-    description = "smart_open is a Python 2 & Python 3 library for efficient streaming of very large file";
+    description = "Library for efficient streaming of very large file";
     maintainers = with lib.maintainers; [ jyp ];
   };
 }
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index 4bca946b341..e781391380e 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -7662,7 +7662,7 @@ in {
 
   sly = callPackage ../development/python-modules/sly { };
 
-  smart_open = callPackage ../development/python-modules/smart_open { };
+  smart-open = callPackage ../development/python-modules/smart-open { };
 
   smartypants = callPackage ../development/python-modules/smartypants { };