diff --git a/src/groovy/org/grails/mandrill/MergeVar.groovy b/src/groovy/org/grails/mandrill/MergeVar.groovy
index 8f8f5d4..db8d7f5 100644
--- a/src/groovy/org/grails/mandrill/MergeVar.groovy
+++ b/src/groovy/org/grails/mandrill/MergeVar.groovy
@@ -2,5 +2,5 @@ package org.grails.mandrill
 
 class MergeVar {
     String name
-    String content
+    def content
 }