diff --git a/modules/dav/main/util.c b/modules/dav/main/util.c
index 1ae5914027c..3f7822fc931 100644
--- a/modules/dav/main/util.c
+++ b/modules/dav/main/util.c
@@ -801,8 +801,14 @@ static dav_error * dav_process_if_header(request_rec *r, dav_if_header **p_ih)
"for the same state.");
}
condition = DAV_IF_COND_NOT;
+ list += 2;
+ }
+ else {
+ return dav_new_error(r->pool, HTTP_BAD_REQUEST,
+ DAV_ERR_IF_UNK_CHAR, 0,
+ "Invalid \"If:\" header: "
+ "Unexpected character in List");
- list += 2;
break;
case ' ':