From aeb164e9f77992ec9ae0708b045689d254ff1331 Mon Sep 17 00:00:00 2001
From: Benjy Cui <benjytrys@gmail.com>
Date: Wed, 26 Apr 2017 16:32:39 +0800
Subject: [PATCH] fix: remove useless space, ref: #66

---
 src/Panel.jsx | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/Panel.jsx b/src/Panel.jsx
index 8acc74ce..841c49d9 100644
--- a/src/Panel.jsx
+++ b/src/Panel.jsx
@@ -21,7 +21,9 @@ class CollapsePanel extends Component {
       showArrow,
       destroyInactivePanel,
     } = this.props;
-    const headerCls = `${prefixCls}-header ${headerClass}`;
+    const headerCls = classNames(`${prefixCls}-header`, {
+      [headerClass]: headerClass,
+    });
     const itemCls = classNames({
       [`${prefixCls}-item`]: true,
       [`${prefixCls}-item-active`]: isActive,