diff --git a/pkgs/development/python-modules/freetype-py/default.nix b/pkgs/development/python-modules/freetype-py/default.nix
index 71b29a54d827..a1259b85673a 100644
--- a/pkgs/development/python-modules/freetype-py/default.nix
+++ b/pkgs/development/python-modules/freetype-py/default.nix
@@ -20,6 +20,8 @@ buildPythonPackage rec {
 
   propagatedBuildInputs = [ freetype ];
 
+  pythonImportsCheck =  [ "freetype" ];
+
   meta = with lib; {
     homepage = "https://github.com/rougier/freetype-py";
     description = "FreeType (high-level Python API)";
diff --git a/pkgs/development/python-modules/vispy/default.nix b/pkgs/development/python-modules/vispy/default.nix
index 61fb42dd2eb8..029132933a9b 100644
--- a/pkgs/development/python-modules/vispy/default.nix
+++ b/pkgs/development/python-modules/vispy/default.nix
@@ -29,6 +29,7 @@ buildPythonPackage rec {
   ];
 
   doCheck = false;  # otherwise runs OSX code on linux.
+  pythonImportsCheck = [ "vispy" ];
 
   meta = with lib; {
     homepage = "http://vispy.org/index.html";