diff --git a/functions b/functions
index 4f40a85..809fc40 100644
--- a/functions
+++ b/functions
@@ -21,7 +21,7 @@ sign_file () {
   local _file="$1"
 
   test ! -f "$_file" && return 1
-  test -f "$_file.sig" || ssh-keygen -Y sign -f ~/.ssh/id_ed25519 -n file "$_file" 2>&1 >/dev/null
+  test -f "$_file.sig" || ssh-keygen -Y sign -f "$private_key" -n file "$_file" 2>&1 >/dev/null
 
   cat "${_file}.sig" | grep -v SIGNATURE | tr -d "\n"
 }