diff --git a/pxtarget.json b/pxtarget.json
index 9743189f..da50c1dd 100644
--- a/pxtarget.json
+++ b/pxtarget.json
@@ -24,6 +24,10 @@
         "deployDrives": "MINI",
         "driveName": "MINI",
         "hexMimeType": "application/x-calliope-hex",
+        "openocdScript": "source [find interface/cmsis-dap.cfg]; source [find target/nrf51.cfg]",
+        "flashUsableEnd": 245760,
+        "flashEnd": 245760,
+        "flashCodeAlign": 1024,
         "upgrades": [
             {
                 "type": "package",