diff --git a/pkgs/development/python-modules/sqlalchemy-imageattach/default.nix b/pkgs/development/python-modules/sqlalchemy-imageattach/default.nix
new file mode 100644
index 00000000000..53eb223b25a
--- /dev/null
+++ b/pkgs/development/python-modules/sqlalchemy-imageattach/default.nix
@@ -0,0 +1,42 @@
+{ stdenv
+, buildPythonPackage
+, fetchFromGitHub
+, pytest
+, Wand
+, webob
+, sqlalchemy
+, isPyPy
+, pkgs
+}:
+
+buildPythonPackage rec {
+  pname = "SQLAlchemy-ImageAttach";
+  version = "1.0.0";
+
+  src = pkgs.fetchFromGitHub {
+    repo = "sqlalchemy-imageattach";
+    owner = "dahlia";
+    rev = "${version}";
+    sha256 = "0ba97pn5dh00qvxyjbr0mr3pilxqw5kb3a6jd4wwbsfcv6nngqig";
+  };
+
+  checkInputs = [ pytest Wand.imagemagick webob ];
+  propagatedBuildInputs = [ sqlalchemy Wand ];
+
+  checkPhase = ''
+    cd tests
+    export MAGICK_HOME="${pkgs.imagemagick.dev}"
+    export PYTHONPATH=$PYTHONPATH:../
+    py.test
+    cd ..
+  '';
+
+  doCheck = !isPyPy;  # failures due to sqla version mismatch
+
+  meta = with stdenv.lib; {
+    homepage = https://github.com/dahlia/sqlalchemy-imageattach;
+    description = "SQLAlchemy extension for attaching images to entity objects";
+    license = licenses.mit;
+  };
+
+}
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index d5de9b31551..e2c9090ce4f 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -3904,36 +3904,7 @@ in {
 
   sqlalchemy = callPackage ../development/python-modules/sqlalchemy { };
 
-  SQLAlchemy-ImageAttach = buildPythonPackage rec {
-    pname = "SQLAlchemy-ImageAttach";
-    version = "1.0.0";
-    name = "${pname}-${version}";
-
-    src = pkgs.fetchFromGitHub {
-      repo = "sqlalchemy-imageattach";
-      owner = "dahlia";
-      rev = "${version}";
-      sha256 = "0ba97pn5dh00qvxyjbr0mr3pilxqw5kb3a6jd4wwbsfcv6nngqig";
-    };
-
-    checkInputs = with self; [ pytest Wand.imagemagick webob ];
-    propagatedBuildInputs = with self; [ sqlalchemy Wand ];
-
-    checkPhase = ''
-      cd tests
-      export MAGICK_HOME="${pkgs.imagemagick.dev}"
-      export PYTHONPATH=$PYTHONPATH:../
-      py.test
-      cd ..
-    '';
-    doCheck = !isPyPy;  # failures due to sqla version mismatch
-
-    meta = {
-      homepage = https://github.com/dahlia/sqlalchemy-imageattach;
-      description = "SQLAlchemy extension for attaching images to entity objects";
-      license = licenses.mit;
-    };
-  };
+  SQLAlchemy-ImageAttach = callPackage ../development/python-modules/sqlalchemy-imageattach { };
 
   sqlalchemy_migrate = callPackage ../development/python-modules/sqlalchemy-migrate { };