diff --git a/.github/ci-test-each-commit-exec.py b/.github/ci-test-each-commit-exec.py
index 14b84cf1f2..966841d650 100755
--- a/.github/ci-test-each-commit-exec.py
+++ b/.github/ci-test-each-commit-exec.py
@@ -27,6 +27,7 @@ def main():
         "cmake",
         "-B",
         "build",
+        "-Werror=dev",
         "-DCMAKE_C_COMPILER=clang",
         "-DCMAKE_CXX_COMPILER=clang++",
         "-DWERROR=ON",
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 168c579340..5e2ed48098 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -223,7 +223,7 @@ jobs:
 
       - name: Generate build system
         run: |
-          cmake -B build --preset vs2022 -DCMAKE_TOOLCHAIN_FILE="${VCPKG_INSTALLATION_ROOT}/scripts/buildsystems/vcpkg.cmake" ${{ matrix.generate-options }}
+          cmake -B build -Werror=dev --preset vs2022 -DCMAKE_TOOLCHAIN_FILE="${VCPKG_INSTALLATION_ROOT}/scripts/buildsystems/vcpkg.cmake" ${{ matrix.generate-options }}
 
       - name: Save vcpkg binary cache
         uses: actions/cache/save@v4
diff --git a/CMakePresets.json b/CMakePresets.json
index 05b055d40b..01d65b1e09 100644
--- a/CMakePresets.json
+++ b/CMakePresets.json
@@ -62,6 +62,7 @@
       "name": "dev-mode",
       "displayName": "Developer mode, with all features/dependencies enabled",
       "binaryDir": "${sourceDir}/build_dev_mode",
+      "errors": {"dev": true},
       "cacheVariables": {
         "BUILD_BENCH": "ON",
         "BUILD_CLI": "ON",
diff --git a/ci/test/03_test_script.sh b/ci/test/03_test_script.sh
index 1884b9525d..e2e7f2f56c 100755
--- a/ci/test/03_test_script.sh
+++ b/ci/test/03_test_script.sh
@@ -118,7 +118,7 @@ BASE_BUILD_DIR=${BASE_BUILD_DIR:-$BASE_SCRATCH_DIR/build-$HOST}
 mkdir -p "${BASE_BUILD_DIR}"
 cd "${BASE_BUILD_DIR}"
 
-BITCOIN_CONFIG_ALL="$BITCOIN_CONFIG_ALL -DCMAKE_INSTALL_PREFIX=$BASE_OUTDIR"
+BITCOIN_CONFIG_ALL="$BITCOIN_CONFIG_ALL -DCMAKE_INSTALL_PREFIX=$BASE_OUTDIR -Werror=dev"
 
 if [[ "${RUN_TIDY}" == "true" ]]; then
   BITCOIN_CONFIG_ALL="$BITCOIN_CONFIG_ALL -DCMAKE_EXPORT_COMPILE_COMMANDS=ON"
diff --git a/contrib/guix/libexec/build.sh b/contrib/guix/libexec/build.sh
index ae98eba744..2b47e1645d 100755
--- a/contrib/guix/libexec/build.sh
+++ b/contrib/guix/libexec/build.sh
@@ -242,6 +242,7 @@ mkdir -p "$DISTSRC"
     cmake -S . -B build \
           --toolchain "${BASEPREFIX}/${HOST}/toolchain.cmake" \
           -DWITH_CCACHE=OFF \
+          -Werror=dev \
           ${CONFIGFLAGS}
 
     # Build Bitcoin Core