diff --git a/src/skins/vector/css/matrix-react-sdk/views/rooms/MemberList.css b/src/skins/vector/css/matrix-react-sdk/views/rooms/MemberList.css
index 5844d5f1d7..4433c1e945 100644
--- a/src/skins/vector/css/matrix-react-sdk/views/rooms/MemberList.css
+++ b/src/skins/vector/css/matrix-react-sdk/views/rooms/MemberList.css
@@ -57,8 +57,8 @@ limitations under the License.
 
 .mx_MemberList_joined {
     order: 2;
-    flex: 1 1 50%;
-    -webkit-flex: 1 1 50%;
+    flex: 1 1 100%;
+    -webkit-flex: 1 1 100%;
 
     overflow-y: auto;
 }
diff --git a/src/skins/vector/css/vector-web/structures/RightPanel.css b/src/skins/vector/css/vector-web/structures/RightPanel.css
index 12e101a37a..f61282b6ca 100644
--- a/src/skins/vector/css/vector-web/structures/RightPanel.css
+++ b/src/skins/vector/css/vector-web/structures/RightPanel.css
@@ -17,6 +17,8 @@ limitations under the License.
 .mx_RightPanel {
     position: relative;
 
+    height: 100%; /* needed for memberlist flexbox to work in chrome 48+ */
+
     display: -webkit-box;
     display: -moz-box;
     display: -ms-flexbox;