1 files changed, 2 insertions, 0 deletions
diff --git a/lib/dgram.js b/lib/dgram.js
index aae2f51bc8..4d6228e1dd 100644
--- a/lib/dgram.js
+++ b/lib/dgram.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';
+
 var assert = require('assert');
 var util = require('util');
 var events = require('events');