diff --git a/wagtail/wagtailadmin/static_src/wagtailadmin/scss/components/datetimepicker.scss b/wagtail/wagtailadmin/static_src/wagtailadmin/scss/components/datetimepicker.scss
index bc5adcfdd..28f2f63ac 100644
--- a/wagtail/wagtailadmin/static_src/wagtailadmin/scss/components/datetimepicker.scss
+++ b/wagtail/wagtailadmin/static_src/wagtailadmin/scss/components/datetimepicker.scss
@@ -7,7 +7,7 @@
 	padding-left: 0px;
 	padding-top: 2px;
 	position: absolute;
-	z-index: 1;
+	z-index: 5;
 	-moz-box-sizing: border-box;
 	box-sizing: border-box;
 	display:none;