diff --git a/pkgs/development/python-modules/ipympl/default.nix b/pkgs/development/python-modules/ipympl/default.nix
index 054372377b6c1..b25f5fd58ae36 100644
--- a/pkgs/development/python-modules/ipympl/default.nix
+++ b/pkgs/development/python-modules/ipympl/default.nix
@@ -21,6 +21,8 @@ buildPythonPackage rec {
   src = fetchPypi {
     inherit pname version format;
     hash = "sha256-WwwIxvT26mVbpYI5NjRXwQ+5IVV/UDjBpG20RX1taw4=";
+    dist = "py3";
+    python = "py3";
   };
 
   propagatedBuildInputs = [
diff --git a/pkgs/development/python-modules/panel/default.nix b/pkgs/development/python-modules/panel/default.nix
index b418757dbe889..d8e0e071df4dc 100644
--- a/pkgs/development/python-modules/panel/default.nix
+++ b/pkgs/development/python-modules/panel/default.nix
@@ -26,6 +26,8 @@ buildPythonPackage rec {
   src = fetchPypi {
     inherit pname version format;
     hash = "sha256-x7ywbO2uY1r06bDXV/+X/7cs9f6jFawyDHeo8pLWZVE=";
+    dist = "py3";
+    python = "py3";
   };
 
   nativeBuildInputs = [