diff --git a/pkgs/development/python-modules/aafigure/default.nix b/pkgs/development/python-modules/aafigure/default.nix
new file mode 100644
index 00000000000..1084eca762b
--- /dev/null
+++ b/pkgs/development/python-modules/aafigure/default.nix
@@ -0,0 +1,32 @@
+{ stdenv, buildPythonPackage, fetchPypi, pillow }:
+
+buildPythonPackage rec {
+  pname = "aafigure";
+  version = "0.5";
+  name = "${pname}-${version}";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "090c88beb091d28a233f854e239713aa15d8d1906ea16211855345c912e8a091";
+  };
+
+  propagatedBuildInputs = [ pillow ];
+
+  # error: invalid command 'test'
+  doCheck = false;
+
+  # Fix impurity. TODO: Do the font lookup using fontconfig instead of this
+  # manual method. Until that is fixed, we get this whenever we run aafigure:
+  #   WARNING: font not found, using PIL default font
+  patchPhase = ''
+    sed -i "s|/usr/share/fonts|/nonexisting-fonts-path|" aafigure/PILhelper.py
+  '';
+
+  meta = with stdenv.lib; {
+    description = "ASCII art to image converter";
+    homepage = https://launchpad.net/aafigure/;
+    license = licenses.bsd2;
+    maintainers = with maintainers; [ bjornfor ];
+    platforms = platforms.linux;
+  };
+}
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index 298c7d9eec6..dadbf0db86d 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -262,34 +262,7 @@ in {
 
   # packages defined here
 
-  aafigure = buildPythonPackage rec {
-    name = "aafigure-0.5";
-
-    src = pkgs.fetchurl {
-      url = "mirror://pypi/a/aafigure/${name}.tar.gz";
-      sha256 = "090c88beb091d28a233f854e239713aa15d8d1906ea16211855345c912e8a091";
-    };
-
-    propagatedBuildInputs = with self; [ pillow ];
-
-    # error: invalid command 'test'
-    doCheck = false;
-
-    # Fix impurity. TODO: Do the font lookup using fontconfig instead of this
-    # manual method. Until that is fixed, we get this whenever we run aafigure:
-    #   WARNING: font not found, using PIL default font
-    patchPhase = ''
-      sed -i "s|/usr/share/fonts|/nonexisting-fonts-path|" aafigure/PILhelper.py
-    '';
-
-    meta = {
-      description = "ASCII art to image converter";
-      homepage = https://launchpad.net/aafigure/;
-      license = licenses.bsd2;
-      platforms = platforms.linux;
-      maintainers = with maintainers; [ bjornfor ];
-    };
-  };
+  aafigure = callPackage ../development/python-modules/aafigure { };
 
   altair = buildPythonPackage rec {
     name = "altair-1.2.0";