diff --git a/home-manager/programs/zsh.nix b/home-manager/programs/zsh.nix
index ea831ac..6775971 100644
--- a/home-manager/programs/zsh.nix
+++ b/home-manager/programs/zsh.nix
@@ -47,13 +47,13 @@ in
           # Strip account ID and hash up to the region part
           URL="''${URL#*\.}"
 
-          PROFILE=$(${pkgs.coreutils}/bin/grep "sso_account_id = $ACCOUNT_ID" ~/.aws/config -B 5 | ${pkgs.coreutils}/bin/grep "\[profile" | ${pkgs.coreutils}/bin/tail -n 1 | ${pkgs.coreutils}/bin/tr -d '[]')
+          PROFILE=$(${pkgs.gnugrep}/bin/grep "sso_account_id = $ACCOUNT_ID" ~/.aws/config -B 5 | ${pkgs.gnugrep}/bin/grep "\[profile" | ${pkgs.coreutils}/bin/tail -n 1 | ${pkgs.coreutils}/bin/tr -d '[]')
           PROFILE="''${PROFILE#profile }"
 
           ROLE_NAME=$(${pkgs.awscli2}/bin/aws configure get profile.$PROFILE.sso_role_name)
           SSO_SESSION=$(${pkgs.awscli2}/bin/aws configure get profile.$PROFILE.sso_session)
 
-          SSO_URL=$(${pkgs.coreutils}/bin/grep "\[sso-session $SSO_SESSION" ~/.aws/config -A5 | ${pkgs.coreutils}/bin/grep sso_start_url | ${pkgs.coreutils}/bin/head -n 1)
+          SSO_URL=$(${pkgs.gnugrep}/bin/grep "\[sso-session $SSO_SESSION" ~/.aws/config -A5 | ${pkgs.gnugrep}/bin/grep sso_start_url | ${pkgs.coreutils}/bin/head -n 1)
           SSO_URL="''${SSO_URL#sso_start_url = }"
           # Strip trailing slash from SSO_URL if present
           SSO_URL="''${SSO_URL%/}"