diff --git a/sudo.h b/sudo.h
index 586be5a59..f5519916c 100644
--- a/sudo.h
+++ b/sudo.h
@@ -195,6 +195,7 @@ extern int num_interfaces;
 extern char *user;
 extern char *epasswd;
 extern char *cmnd;
+extern char *prompt;
 extern int Argc;
 extern char **Argv;
 #endif