diff --git a/warehouse/templates/includes/input-user-name.html b/warehouse/templates/includes/input-user-name.html
index 0584ac0c0d82..59c4e048bb22 100644
--- a/warehouse/templates/includes/input-user-name.html
+++ b/warehouse/templates/includes/input-user-name.html
@@ -11,7 +11,7 @@
  # See the License for the specific language governing permissions and
  # limitations under the License.
 -#}
-{{ form.username_or_email(placeholder="Your username or email", autocorrect="off", autocapitalize="off", spellcheck="false", class="form-group__input") }}
+{{ form.username_or_email(placeholder="Your username or email", autocorrect="off", autocapitalize="off", spellcheck="false", class="form-group__input", required="true") }}
 {% if form.username_or_email.errors %}
   <ul class="form-errors">
     {% for error in form.username_or_email.errors %}