diff --git a/src/playercards/cards/DreamEnhancingSerum.ttslua b/src/playercards/cards/DreamEnhancingSerum.ttslua
index ad69eba0..ecfc8ad6 100644
--- a/src/playercards/cards/DreamEnhancingSerum.ttslua
+++ b/src/playercards/cards/DreamEnhancingSerum.ttslua
@@ -88,6 +88,10 @@ end
 -- counting functions
 ------------------------
 
+function onDrop()
+  updateColors()
+end
+
 -- updates the matcolor and handcolor variable
 function updateColors()
   matColor = playermatApi.getMatColorByPosition(self.getPosition())
@@ -123,4 +127,4 @@ function updateValue()
     size = size + 1
   end
   self.UI.setAttribute("Count", "text", size)
-end
\ No newline at end of file
+end