diff --git a/.murdock b/.murdock
index 3e7584270d..cb11097ded 100755
--- a/.murdock
+++ b/.murdock
@@ -72,7 +72,11 @@ NIGHTLY=${NIGHTLY:-0}
 RUN_TESTS=${RUN_TESTS:-${NIGHTLY}}
 
 DWQ_ENV="-E BOARDS -E APPS -E NIGHTLY -E RUN_TESTS -E ENABLE_TEST_CACHE
-         -E TEST_HASH -E CI_PULL_LABELS"
+         -E TEST_HASH -E CI_PULL_LABELS -EPKG_USE_MIRROR"
+
+if [ ${NIGHTLY} -eq 1 ]; then
+    export PKG_USE_MIRROR=0
+fi
 
 get_supported_kconfig_board_app() {
     local board=$1
diff --git a/pkg/pkg.mk b/pkg/pkg.mk
index eb82b0639c..abc67d51bf 100644
--- a/pkg/pkg.mk
+++ b/pkg/pkg.mk
@@ -24,6 +24,12 @@ ifeq (,$(PKG_LICENSE))
   $(error PKG_LICENSE not defined)
 endif
 
+ifneq (, $(PKG_MIRROR_URL))
+  ifneq (0, $(PKG_USE_MIRROR))
+    PKG_URL = $(PKG_MIRROR_URL)
+  endif
+endif
+
 PKG_DIR ?= $(CURDIR)
 PKG_PATCH_DIR ?= $(PKG_DIR)/patches
 
diff --git a/pkg/yxml/Makefile b/pkg/yxml/Makefile
index 26ecd627be..7a2c8343eb 100644
--- a/pkg/yxml/Makefile
+++ b/pkg/yxml/Makefile
@@ -1,5 +1,6 @@
 PKG_NAME=yxml
 PKG_URL=https://g.blicky.net/yxml.git
+PKG_MIRROR_URL=https://github.com/RIOT-OS-pkgmirror/yxml.git
 PKG_VERSION=f9438757fc49b9f86961ddb55ae430e36bb88ebb
 PKG_LICENSE=MIT