diff --git a/python/servo/build_commands.py b/python/servo/build_commands.py
index f486515560f7..e021b84b7a95 100644
--- a/python/servo/build_commands.py
+++ b/python/servo/build_commands.py
@@ -463,7 +463,9 @@ def build(self, target=None, release=False, dev=False, jobs=None,
 
         if magicleap:
             if platform.system() not in ["Darwin"]:
-                raise Exception("Magic Leap builds are only supported on macOS.")
+                raise Exception("Magic Leap builds are only supported on macOS. "
+                                "If you only wish to test if your code builds, "
+                                "run ./mach build -p libmlservo.")
 
             ml_sdk = env.get("MAGICLEAP_SDK")
             if not ml_sdk: