diff --git a/uasyncio.core/test_full_wait.py b/uasyncio.core/test_full_wait.py
index cf3ed2d1..8954a915 100644
--- a/uasyncio.core/test_full_wait.py
+++ b/uasyncio.core/test_full_wait.py
@@ -1,6 +1,10 @@
 # Test that coros scheduled to run at some time don't run prematurely
 # in case of I/O completion before that.
 import uasyncio.core as uasyncio
+import logging
+logging.basicConfig(level=logging.DEBUG)
+#uasyncio.set_debug(True)
+
 
 class MockEventLoop(uasyncio.EventLoop):
 
@@ -16,15 +20,25 @@ class MockEventLoop(uasyncio.EventLoop):
         self.t += delta
 
     def wait(self, delay):
+        #print("%d: wait(%d)" % (self.t, delay))
         self.pass_time(100)
+
         if self.t == 100:
-            self.call_soon(lambda: self.msgs.append("I should be run first, time: %s" % self.time()))
+            def cb_1st():
+                self.msgs.append("I should be run first, time: %s" % self.time())
+            self.call_soon(cb_1st)
+
         if self.t == 1000:
             raise StopIteration
 
 
 loop = MockEventLoop()
-loop.call_later_ms(500, lambda: loop.msgs.append("I should be run second, time: %s" % loop.time()))
+
+def cb_2nd():
+    loop.msgs.append("I should be run second, time: %s" % loop.time())
+
+loop.call_later_ms(500, cb_2nd)
+
 try:
     loop.run_forever()
 except StopIteration:
@@ -33,4 +47,4 @@ except StopIteration:
 print(loop.msgs)
 # .wait() is now called on each loop iteration, and for our mock case, it means that
 # at the time of running, self.time() will be skewed by 100 virtual time units.
-assert loop.msgs == ['I should be run first, time: 200', 'I should be run second, time: 600']
+assert loop.msgs == ['I should be run first, time: 200', 'I should be run second, time: 600'], str(loop.msgs)