diff --git a/tools/gn b/tools/gn
index 8cf8af92d3166..ee784e5300d33 100755
--- a/tools/gn
+++ b/tools/gn
@@ -232,8 +232,9 @@ def to_gn_args(args):
     if args.arm_float_abi:
       gn_args['arm_float_abi'] = args.arm_float_abi
 
-    # Switch flutter to full Dart SDK.
-    gn_args['dart_platform_sdk'] = False
+    # Switch flutter to full Dart SDK when building for the host system.
+    if args.target_os is None:
+      gn_args['dart_platform_sdk'] = False
 
     return gn_args