diff --git a/propTypes.js b/propTypes.js
index 4a4c7cc..7a3b70b 100644
--- a/propTypes.js
+++ b/propTypes.js
@@ -14,9 +14,7 @@ export default {
   minimumDate: DateType,
   maximumDate: DateType,
   mode: PropTypes.oneOf(['date', 'time', 'datetime']),
-  minuteInterval: PropTypes.oneOf(
-    1 | 2 | 3 | 4 | 5 | 6 | 10 | 12 | 15 | 20 | 30
-  ),  
+  minuteInterval: PropTypes.oneOf([1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30]),  
   locale: PropTypes.string,
   textColor: PropTypes.string,
   timeZoneOffsetInMinutes: PropTypes.number,