diff --git a/.github/workflows/superbuild.yml b/.github/workflows/superbuild.yml
index 69c13e3..e75815a 100644
--- a/.github/workflows/superbuild.yml
+++ b/.github/workflows/superbuild.yml
@@ -38,7 +38,7 @@ jobs:
 
       - name: cmake-configure
         run: |
-          cmake -S . -B ./build -GNinja -DCH10_EX03_SUPERBUILD=ON -DCMAKE_BUILD_TYPE=Debug
+          cmake -S . -B ./build -GNinja -DCH10_EX03_USE_SUPERBUILD=ON -DCMAKE_BUILD_TYPE=Debug
         working-directory: chapter10/ex03_simple_qt_app
 
       - name: build
diff --git a/chapter10/ex03_simple_qt_app/README.md b/chapter10/ex03_simple_qt_app/README.md
index 505579a..e24b5be 100644
--- a/chapter10/ex03_simple_qt_app/README.md
+++ b/chapter10/ex03_simple_qt_app/README.md
@@ -9,8 +9,8 @@ In order to build the project with Ninja and the MSVC compiler, you will need to
 
 ```bash
 C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Auxiliary\Build\vcvarsall.bat x64
-cmake -S . -B build -G Ninja -DCH10_EX03_SUPERBUILD=ON
+cmake -S . -B build -G Ninja -DCH10_EX03_USE_SUPERBUILD=ON
 cmake --build ./build 
 ```
 
-
+(Be sure to replace the path to `vcvarsall.bat` with the correct path for your system.)