diff --git a/templates/front/add_check_modal.html b/templates/front/add_check_modal.html
index e154fb20..294c1a60 100644
--- a/templates/front/add_check_modal.html
+++ b/templates/front/add_check_modal.html
@@ -40,7 +40,7 @@
                                     type="text"
                                     maxlength="100"
                                     value="{{ check.slug }}"
-                                    pattern="[a-z0-9_-]+"
+                                    pattern="[a-z0-9_\-]+"
                                     class="form-control" />
                                 <span class="input-group-btn">
                                     <button
diff --git a/templates/front/update_name_modal.html b/templates/front/update_name_modal.html
index 1a123bbc..e5c504a8 100644
--- a/templates/front/update_name_modal.html
+++ b/templates/front/update_name_modal.html
@@ -45,7 +45,7 @@
                                     type="text"
                                     maxlength="100"
                                     value="{{ check.slug }}"
-                                    pattern="[a-z0-9_-]+"
+                                    pattern="[a-z0-9_\-]+"
                                     data-src-id="update-name-input"
                                     data-btn-id="use-suggested"
                                     data-preview-id="slug-help"