diff --git a/res/css/views/right_panel/_UserInfo.scss b/res/css/views/right_panel/_UserInfo.scss
index 9ce524c5ac..c275f42222 100644
--- a/res/css/views/right_panel/_UserInfo.scss
+++ b/res/css/views/right_panel/_UserInfo.scss
@@ -263,6 +263,7 @@ limitations under the License.
     .mx_UserInfo_verify {
         display: block;
         margin: 16px 0;
+        width: 100%;
     }
 }
 
diff --git a/src/components/views/verification/VerificationShowSas.js b/src/components/views/verification/VerificationShowSas.js
index 7b93f42983..ec222159ab 100644
--- a/src/components/views/verification/VerificationShowSas.js
+++ b/src/components/views/verification/VerificationShowSas.js
@@ -95,7 +95,7 @@ export default class VerificationShowSas extends React.Component {
             confirm = <DialogButtons
                 primaryButton={_t("They match")}
                 onPrimaryButtonClick={this.onMatchClick}
-                primaryButtonClassName="mx_UserInfo_verify"
+                primaryButtonClass="mx_UserInfo_verify"
                 cancelButton={_t("They don't match")}
                 onCancel={this.props.onCancel}
                 cancelButtonClass="mx_UserInfo_verify"