--- auth2-pubkey.c	2019-05-14 12:41:42.185855228 +0200
+++ auth2-pubkey.c	2019-05-14 12:44:49.649864899 +0200
@@ -446,6 +446,7 @@
 		    username, strerror(errno));
 		goto out;
 	}
+	command = strdup(options.authorized_principals_command);
 
 	/* Turn the command into an argument vector */
 	if (argv_split(options.authorized_principals_command, &ac, &av) != 0) {