diff --git a/tools/build.py b/tools/build.py
index 9c72266dd6f..a4ccf5e45a6 100755
--- a/tools/build.py
+++ b/tools/build.py
@@ -301,9 +301,10 @@ def Main():
   if not ProcessOptions(options, args):
     parser.print_help()
     return 1
-  # Determine which targets to build. By default we build the "all" target.
+  # Determine which targets to build. The default is the "create_sdk" target,
+  # as the "all" target is unsupported and not built on any of the bots.
   if len(args) == 0:
-    targets = ['all']
+    targets = ['create_sdk']
   else:
     targets = args