diff --git a/samples/HelloCpp/proj.android/build_native.sh b/samples/HelloCpp/proj.android/build_native.sh
index e14fddce76..63cce90a30 100755
--- a/samples/HelloCpp/proj.android/build_native.sh
+++ b/samples/HelloCpp/proj.android/build_native.sh
@@ -67,10 +67,12 @@ done
 
 if [[ "$buildexternalsfromsource" ]]; then
     echo "Building external dependencies from source"
+    set -x
     "$NDK_ROOT"/ndk-build -C "$APP_ANDROID_ROOT" $* \
         "NDK_MODULE_PATH=${COCOS2DX_ROOT}:${COCOS2DX_ROOT}/cocos2dx/platform/third_party/android/source"
 else
     echo "Using prebuilt externals"
+    set -x
     "$NDK_ROOT"/ndk-build -C "$APP_ANDROID_ROOT" $* \
         "NDK_MODULE_PATH=${COCOS2DX_ROOT}:${COCOS2DX_ROOT}/cocos2dx/platform/third_party/android/prebuilt"
 fi