diff --git a/arch-config/scripts/arch-config.sh b/arch-config/scripts/arch-config.sh
index a1bdc154..9748855c 100755
--- a/arch-config/scripts/arch-config.sh
+++ b/arch-config/scripts/arch-config.sh
@@ -408,9 +408,7 @@ EOF
 
 # automatically add ssh keys to agent
 if ! grep -q "AddKeysToAgent yes" "$HOME/.ssh/config"; then
-    sed -i '' '1i\
-    AddKeysToAgent yes
-    ' "$HOME/.ssh/config"
+    sed -i '1s/^/AddKeysToAgent yes\n/' "$HOME/.ssh/config"
     echo works
 fi