diff --git a/pkgs/development/python-modules/cov-core/default.nix b/pkgs/development/python-modules/cov-core/default.nix
new file mode 100644
index 000000000000..ad85218709e8
--- /dev/null
+++ b/pkgs/development/python-modules/cov-core/default.nix
@@ -0,0 +1,17 @@
+{ stdenv, buildPythonPackage, fetchPypi, coverage }:
+
+buildPythonPackage rec {
+  pname = "cov-core";
+  version = "1.15.0";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "0k3np9ymh06yv1ib96sb6wfsxjkqhmik8qfsn119vnhga9ywc52a";
+  };
+
+  propagatedBuildInputs = [ coverage ];
+
+  meta = with stdenv.lib; {
+    description = "Plugin core for use by pytest-cov, nose-cov and nose2-cov";
+  };
+}
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index 3bbdd68c7fec..6be44b18c098 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -1653,17 +1653,7 @@ in {
 
   coverage = callPackage ../development/python-modules/coverage { };
 
-  covCore = buildPythonPackage rec {
-    name = "cov-core-1.15.0";
-    src = pkgs.fetchurl {
-      url = "mirror://pypi/c/cov-core/${name}.tar.gz";
-      sha256 = "4a14c67d520fda9d42b0da6134638578caae1d374b9bb462d8de00587dba764c";
-    };
-    meta = {
-      description = "Plugin core for use by pytest-cov, nose-cov and nose2-cov";
-    };
-    propagatedBuildInputs = with self; [ self.coverage ];
-  };
+  covCore = callPackage ../development/python-modules/cov-core { };
 
   crcmod = buildPythonPackage rec {
     name = "crcmod-1.7";