diff --git a/sdk/boards/sonata-prerelease.json b/sdk/boards/sonata-prerelease.json
index 41a3812..85392b8 100644
--- a/sdk/boards/sonata-prerelease.json
+++ b/sdk/boards/sonata-prerelease.json
@@ -93,7 +93,7 @@
         "ipconfigDRIVER_INCLUDED_RX_IP_CHECKSUM=1",
         "ipconfigDRIVER_INCLUDED_TX_IP_CHECKSUM=1"
     ],
-    "cxflags": "-enable-machine-outliner=never",
+    "cxflags": "-mllvm -enable-machine-outliner=never",
     "driver_includes" : [
         "../include/platform/sunburst",
         "../include/platform/ibex",
diff --git a/sdk/boards/sonata-simulator.json b/sdk/boards/sonata-simulator.json
index 512b426..2573a40 100644
--- a/sdk/boards/sonata-simulator.json
+++ b/sdk/boards/sonata-simulator.json
@@ -61,6 +61,7 @@
         "ipconfigDRIVER_INCLUDED_RX_IP_CHECKSUM=1",
         "ipconfigDRIVER_INCLUDED_TX_IP_CHECKSUM=1"
     ],
+    "cxflags": "-mllvm -enable-machine-outliner=never",
     "driver_includes" : [
         "../include/platform/sunburst",
         "../include/platform/ibex",