diff --git a/css/structure/jquery.mobile.core.css b/css/structure/jquery.mobile.core.css
index d2614ffa796..4286d75ea2b 100644
--- a/css/structure/jquery.mobile.core.css
+++ b/css/structure/jquery.mobile.core.css
@@ -1,6 +1,6 @@
 /* Some unsets */
 .ui-mobile,
-.ui-mobile body {
+.ui-mobile .ui-mobile-viewport {
 	height: 99.9%;
 }
 .ui-mobile fieldset,