diff --git a/devenv.nix b/devenv.nix
index 547b5e8..393a24d 100644
--- a/devenv.nix
+++ b/devenv.nix
@@ -48,8 +48,8 @@
     black.enable = true;
     # sort imports
     isort.enable = true;
-    # line length the same for black and isort
-    isort.settings.flags = "-l 88";
+    # same profile for black and isort
+    isort.settings.flags = "--profile black";
     # look for code smell
     # pylint.enable = true;
     detect-private-keys.enable = true;