diff --git a/third-party/libjxl/build-libjxl-bazel.sh b/third-party/libjxl/build-libjxl-bazel.sh
index 17d46032b9..993dbf929f 100755
--- a/third-party/libjxl/build-libjxl-bazel.sh
+++ b/third-party/libjxl/build-libjxl-bazel.sh
@@ -15,6 +15,7 @@ if [ "$ARCH" = "arm64" ]; then
   IOS_PLATFORMDIR="$(xcode-select -p)/Platforms/iPhoneOS.platform"
   IOS_SYSROOT=($IOS_PLATFORMDIR/Developer/SDKs/iPhoneOS*.sdk)
   export CFLAGS="-Wall -arch arm64 -miphoneos-version-min=12.0 -funwind-tables"
+  export CXXFLAGS="$CFLAGS"
 
   cd "$BUILD_DIR"
   mkdir build
@@ -31,7 +32,8 @@ elif [ "$ARCH" = "sim_arm64" ]; then
   IOS_PLATFORMDIR="$(xcode-select -p)/Platforms/iPhoneSimulator.platform"
   IOS_SYSROOT=($IOS_PLATFORMDIR/Developer/SDKs/iPhoneSimulator*.sdk)
   export CFLAGS="-Wall -arch arm64 --target=arm64-apple-ios12.0-simulator -miphonesimulator-version-min=12.0 -funwind-tables"
-
+  export CXXFLAGS="$CFLAGS"
+  
   cd "$BUILD_DIR"
   mkdir build
   cd build
@@ -47,7 +49,8 @@ elif [ "$ARCH" = "x86_64" ]; then
   IOS_PLATFORMDIR="$(xcode-select -p)/Platforms/iPhoneSimulator.platform"
   IOS_SYSROOT=($IOS_PLATFORMDIR/Developer/SDKs/iPhoneSimulator*.sdk)
   export CFLAGS="-Wall -arch x86_64 -miphoneos-version-min=12.0 -funwind-tables"
-
+  export CXXFLAGS="$CFLAGS"
+  
   cd "$BUILD_DIR"
   mkdir build
   cd build