--- main.c.orig	2022-03-30 19:34:50 UTC
+++ main.c
@@ -308,7 +308,7 @@ main(int argc, char **argv)
 	if ( squash )
 	    mkd_e_anchor(doc, (mkd_callback_t) anchor_format);
 	if ( use_e_codefmt )
-	    mkd_e_code_format(doc, external_codefmt);
+	    mkd_e_code_format(doc, (mkd_callback_t) external_codefmt);
 
 	if ( use_e_codefmt || squash )
 	    mkd_e_free(doc, free_it);
