diff --git a/node-uuid/node-uuid.d.ts b/node-uuid/node-uuid.d.ts
index b069e8f37f..c4fa865e52 100644
--- a/node-uuid/node-uuid.d.ts
+++ b/node-uuid/node-uuid.d.ts
@@ -23,7 +23,7 @@ interface UUIDOptions {
      * (Number | Date) Time in milliseconds since unix Epoch.
      * Default: The current time is used.
      */
-    msecs?: any
+    msecs?: number|Date
 
     /**
      * (Number between 0-9999) additional time, in 100-nanosecond units. Ignored if msecs is unspecified.