diff --git a/expert/field.py b/expert/field.py
index 7ee201a..c8bd500 100644
--- a/expert/field.py
+++ b/expert/field.py
@@ -222,6 +222,7 @@ class SubReport(ReportInstance):
 
 class SubReportField(Field):
 
+    template = None
     renderer = 'subreport'
     reportFactory = SubReport