diff --git a/ugranada.json b/ugranada.json
index f737d06..48c154d 100644
--- a/ugranada.json
+++ b/ugranada.json
@@ -4,6 +4,7 @@
     "hw_rev": "v1.1",
     "base": "standalone",
     "core_addr": "10.34.16.100",
+    "ext_ref_frequency": 10e6,
     "vendor": "QUARTIQ",
     "peripherals": [
         {