diff --git a/test/basic_test.lua b/test/basic_test.lua
index 9515469..f6a6719 100644
--- a/test/basic_test.lua
+++ b/test/basic_test.lua
@@ -138,6 +138,8 @@ function g.test_delayed_queue()
 		{ name = 'payload', type = 'any'      },
 	})
 
+	local F = { id = 1, status = 2, runat = 3, payload = 4 }
+
 	queue:create_index('primary', { parts = {'id'} })
 	queue:create_index('status', { parts = {'status', 'id'} })
 	queue:create_index('runat', { parts = {'runat', 'id'} })
@@ -210,7 +212,7 @@ function g.test_delayed_queue()
 
 	queue:ack(take, {
 		update = {
-			{ '=', 'payload', { finished = 2 } },
+			{ '=', F.payload, { finished = 2 } },
 		},
 		delay = 0.5,
 	})
diff --git a/test/network_test.lua b/test/network_test.lua
index a986ff6..19d7506 100644
--- a/test/network_test.lua
+++ b/test/network_test.lua
@@ -28,6 +28,7 @@ function g.test_untake()
 		{ name = 'runat',   type = 'number'   },
 		{ name = 'payload', type = 'any'      },
 	})
+	local F = { id = 1, status = 2, runat = 3, payload = 4 }
 
 	queue:create_index('primary', { parts = {'id'} })
 	queue:create_index('status', { parts = {'status', 'id'} })
@@ -77,7 +78,7 @@ function g.test_untake()
 	t.assert_equals(task.id, taken.id, "retutned the same task (2nd)")
 
 	local processed_at = clock.time()
-	local acked = tt:call('box.space.queue:ack', {taken, { update = {{'=', 'payload', { processed_at = processed_at }}} }}, {timeout = 1})
+	local acked = tt:call('box.space.queue:ack', {taken, { update = {{'=', F.payload, { processed_at = processed_at }}} }}, {timeout = 1})
 	t.assert_equals(acked[1], taken.id, ":ack() returned taken but completed task")
 
 	local awaiter_res = awaiter_fin:get()