diff --git a/Dapper/SqlMapper.GridReader.cs b/Dapper/SqlMapper.GridReader.cs
index 71f8d2ac61390b9d43b58f4f2cc927d2985768e1..c4c2253729d07464e1e6389174099a643e7391e8 100644
--- a/Dapper/SqlMapper.GridReader.cs
+++ b/Dapper/SqlMapper.GridReader.cs
@@ -215,6 +215,9 @@ private T ReadRow<T>(Type type, Row row)
                     typeof(TSixth),
                     typeof(TSeventh)
                 }, gridIndex);
+
+                IsConsumed = true;
+
                 try
                 {
                     foreach (var r in MultiMapImpl<TFirst, TSecond, TThird, TFourth, TFifth, TSixth, TSeventh, TReturn>(null, default(CommandDefinition), func, splitOn, reader, identity, false))