diff --git a/res/css/views/rooms/_JumpToBottomButton.scss b/res/css/views/rooms/_JumpToBottomButton.scss
index c4408b4dd1..4659442d9b 100644
--- a/res/css/views/rooms/_JumpToBottomButton.scss
+++ b/res/css/views/rooms/_JumpToBottomButton.scss
@@ -70,5 +70,6 @@ limitations under the License.
     mask: url('$(res)/img/icon-jump-to-bottom.svg');
     mask-repeat: no-repeat;
     mask-position: center;
+    mask-size: 50%;
     background: $muted-fg-color;
 }