diff --git a/pkgs/pinentry-selector.nix b/pkgs/pinentry-selector.nix
index a2ecc9c..55c722f 100644
--- a/pkgs/pinentry-selector.nix
+++ b/pkgs/pinentry-selector.nix
@@ -9,10 +9,10 @@ pkgs.writeShellApplication {
       /dev/tty[1-9])
         pinentry-curses;;
       /dev/pts/*)
-        if [ -z "$SSH_CLIENT" ]; then
-          pinentry-qt
-        else
+        if [ -v SSH_CLIENT ] && [ -n "$SSH_CLIENT" ]; then
           pinentry-curses
+        else
+          pinentry-qt
         fi
       ;;
       *)