diff --git a/sdk/BUILD.gn b/sdk/BUILD.gn
index e571a2bbc84..f742a8b23c9 100644
--- a/sdk/BUILD.gn
+++ b/sdk/BUILD.gn
@@ -8,7 +8,7 @@ dart_pkg("sky") {
   sources = [
     "CHANGELOG.md",
     "bin/init.dart",
-    "lib/.sdkext",
+    "lib/_sdkext",
     "lib/animation/animated_value.dart",
     "lib/animation/animation_performance.dart",
     "lib/animation/curves.dart",
diff --git a/sdk/lib/.sdkext b/sdk/lib/_sdkext
similarity index 100%
rename from sdk/lib/.sdkext
rename to sdk/lib/_sdkext
diff --git a/sdk/lib/sky_tool b/sdk/lib/sky_tool
index a9a3bacb1fb..e57159c45be 100755
--- a/sdk/lib/sky_tool
+++ b/sdk/lib/sky_tool
@@ -135,7 +135,7 @@ class StartSky(object):
         if os.path.isdir(project_or_path):
             sky_server_root = project_or_path
             main_dart = os.path.join(project_or_path, 'lib', 'main.dart')
-            missing_msg = "Missing lib/main.dart in project: %s" % project_dir
+            missing_msg = "Missing lib/main.dart in project: %s" % project_or_path
         else:
             # FIXME: This assumes the path is at the root of the project!
             # Instead we should walk up looking for a pubspec.yaml