diff --git a/src/Calendar.jsx b/src/Calendar.jsx
index cd4da456..ad52050d 100644
--- a/src/Calendar.jsx
+++ b/src/Calendar.jsx
@@ -289,7 +289,7 @@ const Calendar = createReactClass({
             selectedValue={selectedValue}
             value={value}
             disabledDate={disabledDate}
-            okDisabled={!this.isAllowedDate(selectedValue)}
+            okDisabled={props.showOk && !this.isAllowedDate(selectedValue)}
             onOk={this.onOk}
             onSelect={this.onSelect}
             onToday={this.onToday}