diff --git a/template/modal/backdrop.html b/template/modal/backdrop.html
index 048497f558..2e6fbec9ee 100644
--- a/template/modal/backdrop.html
+++ b/template/modal/backdrop.html
@@ -1 +1,4 @@
-<div class="modal-backdrop fade" ng-class="{in: animate}" ng-style="{'z-index': 1040 + index*10}"></div>
\ No newline at end of file
+<div class="modal-backdrop fade"
+     ng-class="{in: animate}"
+     ng-style="{'z-index': 1040 + (index && 1 || 0) + index*10}"
+></div>