diff --git a/imap/http_dav.c b/imap/http_dav.c
index 8c783d5c97..f67eaa82e3 100644
--- a/imap/http_dav.c
+++ b/imap/http_dav.c
@@ -113,6 +113,9 @@ static const struct dav_namespace_t {
     { XML_NS_SYSFLAG, "SF" },
 };
 
+#define NUM_KNOWN_NAMESPACES                                    \
+    (sizeof(known_namespaces) / sizeof(struct dav_namespace_t))
+
 static const struct match_type_t dav_match_types[] = {
     { "contains", MATCH_TYPE_CONTAINS },
     { "equals", MATCH_TYPE_EQUALS },
@@ -3702,6 +3705,7 @@ static int do_proppatch(struct proppatch_ctx *pctx, xmlNodePtr instr)
                          entry++);
 
                     if (entry->name) {
+                        prop->ns = pctx->ns[entry->ns];
                         int rights = httpd_myrights(httpd_authstate,
                                                     pctx->txn->req_tgt.mbentry);
                         if (!entry->put) {
@@ -3738,7 +3742,14 @@ static int do_proppatch(struct proppatch_ctx *pctx, xmlNodePtr instr)
                     }
                     else if (pctx->txn->req_tgt.namespace->id != URL_NS_PRINCIPAL) {
                         /* Write "dead" property */
-                        proppatch_todb(prop, set, pctx, propstat, NULL);
+                        for (size_t i = 0; i < NUM_KNOWN_NAMESPACES; i++) {
+                            if (!strcmp((const char *) prop->ns->href,
+                                        known_namespaces[i].href)) {
+                                prop->ns = pctx->ns[i];
+                                break;
+                            }
+                        }
+                        proppatch_todb_internal(prop, set, pctx, propstat, NULL, 1);
                     }
                 }
             }