diff --git a/res/css/views/rooms/_MemberDeviceInfo.scss b/res/css/views/rooms/_MemberDeviceInfo.scss
index 3be6a0f7b4..951d1945b1 100644
--- a/res/css/views/rooms/_MemberDeviceInfo.scss
+++ b/res/css/views/rooms/_MemberDeviceInfo.scss
@@ -57,6 +57,7 @@ limitations under the License.
 }
 
 .mx_MemberDeviceInfo_deviceId {
+    word-break: break-word;
     font-size: 13px;
 }