diff --git a/src/skins/vector/css/matrix-react-sdk/views/rooms/_MessageComposer.scss b/src/skins/vector/css/matrix-react-sdk/views/rooms/_MessageComposer.scss
index 89ae2d67ac..a4b26cc473 100644
--- a/src/skins/vector/css/matrix-react-sdk/views/rooms/_MessageComposer.scss
+++ b/src/skins/vector/css/matrix-react-sdk/views/rooms/_MessageComposer.scss
@@ -97,6 +97,7 @@ limitations under the License.
     flex: 1;
     max-height: 120px;
     overflow: auto;
+    word-break: break-word;
 }
 
 .mx_MessageComposer_input blockquote {