diff --git a/library.properties b/library.properties
index bb2426a..80f1662 100644
--- a/library.properties
+++ b/library.properties
@@ -7,3 +7,4 @@ paragraph=The DCF77 library has been designed to work in conjunction with Arduin
 category=Timing 
 url=http://playground.arduino.cc/Code/DCF77
 architectures=*
+depends=Time