diff --git a/engine/src/flutter/BUILD.gn b/engine/src/flutter/BUILD.gn
index 5a686fbbd7..f40a6ca52e 100644
--- a/engine/src/flutter/BUILD.gn
+++ b/engine/src/flutter/BUILD.gn
@@ -9,7 +9,6 @@ group("sky") {
   testonly = true
 
   deps = [
-    "//mojo",
     "//sky/engine/platform:platform_unittests",
     "//sky/engine/web:sky_unittests",
     "//sky/engine/wtf:unittests",
diff --git a/engine/src/flutter/HACKING.md b/engine/src/flutter/HACKING.md
index c0c5688051..b2c18c2dbf 100644
--- a/engine/src/flutter/HACKING.md
+++ b/engine/src/flutter/HACKING.md
@@ -5,12 +5,6 @@ Building
 --------
 
 * Follow the setup & build instructions for [Mojo](https://github.com/domokit/mojo)
-* Build ``sky`` with ``ninja``, e.g. ``ninja -C out/Debug sky`` for a debug build.
-
-If you want to build release, run the following commands:
-
-* ``gn gen out/Release --args="is_debug=false"``
-* ``ninja -C out/Release sky``
 
 Running applications
 --------------------