diff --git a/src/backend/utils/adt/rowtypes.c b/src/backend/utils/adt/rowtypes.c
index 0214c23a1d4..a4d32f8013b 100644
--- a/src/backend/utils/adt/rowtypes.c
+++ b/src/backend/utils/adt/rowtypes.c
@@ -2012,7 +2012,7 @@ hash_record_extended(PG_FUNCTION_ARGS)
 			locfcinfo->args[0].value = values[i];
 			locfcinfo->args[0].isnull = false;
 			locfcinfo->args[1].value = Int64GetDatum(seed);
-			locfcinfo->args[0].isnull = false;
+			locfcinfo->args[1].isnull = false;
 			element_hash = DatumGetUInt64(FunctionCallInvoke(locfcinfo));
 
 			/* We don't expect hash support functions to return null */