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-rw-r--r--lib/string_decoder.js2
1 files changed, 2 insertions, 0 deletions
diff --git a/lib/string_decoder.js b/lib/string_decoder.js
index fd11e51c8d..84ac9a9d44 100644
--- a/lib/string_decoder.js
+++ b/lib/string_decoder.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';
+
function assertEncoding(encoding) {
if (encoding && !Buffer.isEncoding(encoding)) {
throw new Error('Unknown encoding: ' + encoding);