diff --git a/gram/test/test_core_refresher.py b/gram/test/test_core_refresher.py
index 7460442..6c924d1 100644
--- a/gram/test/test_core_refresher.py
+++ b/gram/test/test_core_refresher.py
@@ -13,11 +13,11 @@ def generic_test(abits, babits, trp, trfc):
 
             def process():
                 yield dut.start.eq(1)
-                yield
-                yield
+                yield; yield Delay(1e-8)
                 self.assertEqual((yield dut.a), 2**10)
                 for i in range(trp):
                     yield
+                yield Delay(1e-8)
                 self.assertEqual((yield dut.a), 0)
 
             runSimulation(dut, process, "test_refreshexecuter.vcd")
@@ -77,8 +77,7 @@ def process():
                     yield
 
                 yield dut.req_i.eq(0)
-                yield
-                yield
+                yield; yield Delay(1e-8)
 
                 self.assertFalse((yield dut.req_o))