diff --git a/src/Val.cc b/src/Val.cc
index 66e8b8d568..0fb99ff24d 100644
--- a/src/Val.cc
+++ b/src/Val.cc
@@ -1993,9 +1993,9 @@ ValPtr TableVal::FindOrDefault(const ValPtr& index)
 
 const bool TableVal::Contains(const IPAddr& addr)
 	{
-        if ( ! subnets )
+	if ( ! subnets )
 		{
-                reporter->InternalError("LookupSubnets called on wrong table type");
+		reporter->InternalError("'Contains' called on wrong table/set type");
 		return false;
 		}