diff --git a/pkgs/development/python-modules/aresponses/default.nix b/pkgs/development/python-modules/aresponses/default.nix
index c790f4804105..56093192d6c7 100644
--- a/pkgs/development/python-modules/aresponses/default.nix
+++ b/pkgs/development/python-modules/aresponses/default.nix
@@ -6,12 +6,15 @@
 # buildInputs
 , pytest
 , pytest-asyncio
+, isPy3k
 }:
 
 buildPythonPackage rec {
   pname = "aresponses";
   version = "2.0.0";
 
+  disabled = !isPy3k;
+
   src = fetchPypi {
     inherit pname version;
     sha256 = "58693a6b715edfa830a20903ee1d1b2a791251923f311b3bebf113e8ff07bb35";
diff --git a/pkgs/development/python-modules/pyhaversion/default.nix b/pkgs/development/python-modules/pyhaversion/default.nix
index 381ec45388bf..4fb28fb762dd 100644
--- a/pkgs/development/python-modules/pyhaversion/default.nix
+++ b/pkgs/development/python-modules/pyhaversion/default.nix
@@ -1,6 +1,7 @@
 { lib
 , buildPythonPackage
 , fetchPypi
+, isPy3k
 # propagatedBuildInputs
 , aiohttp
 , async-timeout
@@ -15,6 +16,9 @@ buildPythonPackage rec {
   pname = "pyhaversion";
   version = "3.3.0";
 
+  # needs aiohttp which is py3k-only
+  disabled = !isPy3k;
+
   src = fetchPypi {
     inherit pname version;
     sha256 = "376a1b232a26035bc82d64affa1c4f312d782234fe5453e8d0f9e1350a97be5b";