diff --git a/utils/rowgroup/rowaggregation.cpp b/utils/rowgroup/rowaggregation.cpp
index d624c5cab..bdad3b594 100755
--- a/utils/rowgroup/rowaggregation.cpp
+++ b/utils/rowgroup/rowaggregation.cpp
@@ -3306,6 +3306,7 @@ void RowAggregationUM::calculateUDAFColumns()
 
             // Set the returned value into the output row
             SetUDAFValue(valOut, colOut);
+            valOut.reset();
         }
 
         fRGContext.setUserData(NULL);