diff --git a/res/css/structures/_RoomView.scss b/res/css/structures/_RoomView.scss
index 572c7166d2..571c34fcb0 100644
--- a/res/css/structures/_RoomView.scss
+++ b/res/css/structures/_RoomView.scss
@@ -205,6 +205,10 @@ limitations under the License.
     clear: both;
 }
 
+.mx_RoomView_MessageList .katex {
+    font-size: 1.3em;
+}
+
 li.mx_RoomView_myReadMarker_container {
     height: 0px;
     margin: 0px;