diff --git a/plugins/mod_storage_sql.lua b/plugins/mod_storage_sql.lua
index ae6a2676e..cf92e31c4 100644
--- a/plugins/mod_storage_sql.lua
+++ b/plugins/mod_storage_sql.lua
@@ -11,7 +11,7 @@ local is_stanza = require"util.stanza".is_stanza;
 local t_concat = table.concat;
 
 local noop = function() end
-local unpack = unpack
+local unpack = table.unpack or unpack;
 local function iterator(result)
 	return function(result_)
 		local row = result_();