diff --git a/scripts/imgtool/keys/general.py b/scripts/imgtool/keys/general.py
index 77caf5d..033a70f 100644
--- a/scripts/imgtool/keys/general.py
+++ b/scripts/imgtool/keys/general.py
@@ -6,6 +6,7 @@
 
 AUTOGEN_MESSAGE = "/* Autogenerated by imgtool.py, do not edit. */"
 
+
 class KeyClass(object):
     def _emit(self, header, trailer, encoded_bytes, indent, file=sys.stdout, len_format=None):
         print(AUTOGEN_MESSAGE, file=file)
@@ -40,11 +41,11 @@
     def emit_public_pem(self, file=sys.stdout):
         print(str(self.get_public_pem(), 'utf-8'), file=file, end='')
 
-    def emit_private(self, minimal, file=sys.stdout):
+    def emit_private(self, minimal, format, file=sys.stdout):
         self._emit(
                 header="const unsigned char enc_priv_key[] = {",
                 trailer="};",
-                encoded_bytes=self.get_private_bytes(minimal),
+                encoded_bytes=self.get_private_bytes(minimal, format),
                 indent="    ",
                 len_format="const unsigned int enc_priv_key_len = {};",
                 file=file)