diff --git a/library.properties b/library.properties
index e9204e7..5250c24 100644
--- a/library.properties
+++ b/library.properties
@@ -7,5 +7,5 @@ paragraph=The DS1603L is an ultrasound water level sensor, which works from the
 category=Sensors
 url=http://cityhydroponics.hk/
 architectures=*
-includes=
+includes=DS1603L.h