diff --git a/CMakeLists.txt b/CMakeLists.txt
index d37aac35e9..9e3370fea5 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -91,6 +91,18 @@ elseif(IOS)
     set(DEPLOYMENT_TARGET "13" CACHE STRING "")
 endif()
 
+if(CMAKE_HOST_APPLE
+   AND CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR
+   AND NOT CMAKE_TOOLCHAIN_FILE
+   AND NOT IOS
+   AND NOT VISIONOS
+   AND NOT CMAKE_OSX_SYSROOT)
+    # Use one coherent Xcode SDK for headers and frameworks. Leaving this empty
+    # can mix Command Line Tools headers with frameworks from the selected
+    # Xcode, which turns SDK-only diagnostics into warnings-as-errors.
+    set(CMAKE_OSX_SYSROOT macosx CACHE STRING "macOS SDK" FORCE)
+endif()
+
 project(BabylonNative)
 
 set_property(GLOBAL PROPERTY USE_FOLDERS ON)
diff --git a/Dependencies/CMakeLists.txt b/Dependencies/CMakeLists.txt
index 49b360250a..8db2a2d698 100644
--- a/Dependencies/CMakeLists.txt
+++ b/Dependencies/CMakeLists.txt
@@ -191,6 +191,16 @@ endif()
 # --------------------------------------------------
 FetchContent_MakeAvailable_With_Message(JsRuntimeHost)
 
+if(APPLE AND NAPI_JAVASCRIPT_ENGINE STREQUAL "JavaScriptCore" AND TARGET napi)
+    # find_library adds the SDK framework directory with -F, which does not
+    # classify framework headers as system headers. JsRuntimeHost uses
+    # -pedantic -Werror, so make that classification explicit for napi and all
+    # consumers while preserving warnings-as-errors for project sources.
+    get_filename_component(_JAVASCRIPTCORE_FRAMEWORKS_DIR "${JAVASCRIPTCORE_LIBRARY}" DIRECTORY)
+    target_compile_options(napi PUBLIC "SHELL:-iframework ${_JAVASCRIPTCORE_FRAMEWORKS_DIR}")
+    unset(_JAVASCRIPTCORE_FRAMEWORKS_DIR)
+endif()
+
 # --------------------------------------------------
 # metal-cpp
 # --------------------------------------------------