diff --git a/main/rfc1867.c b/main/rfc1867.c
index 27bdf928a50..21642c59ff8 100644
--- a/main/rfc1867.c
+++ b/main/rfc1867.c
@@ -1172,6 +1172,7 @@ static SAPI_POST_HANDLER_FUNC(rfc1867_post_handler_unicode)
 						goto var_done;
 					}
 				} else {
+					u_val_len = 0;
 					u_val = USTR_MAKE("");
 				}