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-rw-r--r--lib/sys.js2
1 files changed, 2 insertions, 0 deletions
diff --git a/lib/sys.js b/lib/sys.js
index cf98a073e6..6dc415c31f 100644
--- a/lib/sys.js
+++ b/lib/sys.js
@@ -19,6 +19,8 @@
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.
+'use strict';
+
// the sys module was renamed to 'util'.
// this shim remains to keep old programs working.
module.exports = require('util');