1 files changed, 2 insertions, 0 deletions
diff --git a/lib/timers.js b/lib/timers.js
index 3039b49f2c..b5fd04ee32 100644
--- a/lib/timers.js
+++ b/lib/timers.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 Timer = process.binding('timer_wrap').Timer;
 var L = require('_linklist');
 var assert = require('assert').ok;