diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index 0773a1984ab5..f7e892378000 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -4619,7 +4619,7 @@ in {
 
   offtrac = callPackage ../development/python-modules/offtrac { };
 
-  openpyxl = if isPy3k then
+  openpyxl = if pythonAtLeast "3.6" then
     callPackage ../development/python-modules/openpyxl { }
   else
     callPackage ../development/python-modules/openpyxl/2.nix { };