diff --git a/pxtarget.json b/pxtarget.json
index 90cbddc5..949ac2d2 100644
--- a/pxtarget.json
+++ b/pxtarget.json
@@ -56,6 +56,9 @@
         "hasHex": true,
         "deployDrives": "^MICROBIT"
     },
+    "runtime": {
+      "mathBlocks": true
+    },
     "simulator": {
         "autoRun": true
     },