diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 5b667c16..4d39e9df 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -47,7 +47,7 @@ jobs:
 
       - name: Build
         run: |
-          cmake -S . -B build -DCMAKE_BUILD_TYPE=Debug -GNinja
+          cmake -S . -B build -DCMAKE_BUILD_TYPE=Debug -GNinja -Werror=dev
           cmake --build build
 
   build:
diff --git a/CMakeLists.txt b/CMakeLists.txt
index e1cc475a..e374fb19 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -2,6 +2,12 @@ cmake_minimum_required(VERSION 3.13 FATAL_ERROR)
 
 project(isle CXX)
 
+math(EXPR bits "8 * ${CMAKE_SIZEOF_VOID_P}")
+message(STATUS "Building ${bits}-bit Lego Island")
+if (NOT bits EQUAL 32)
+    message(WARNING "Only 32-bit executables are supported")
+endif()
+
 set(MSVC_FOR_DECOMP FALSE)
 if (MSVC)
     # Visual C++ 4.2 -> cl version 10.2.0