diff --git a/goodwe_controller/test_opt34.py b/goodwe_controller/test_opt34.py
index bf83d36..869e7fc 100644
--- a/goodwe_controller/test_opt34.py
+++ b/goodwe_controller/test_opt34.py
@@ -347,7 +347,6 @@ def run_night(spec):
 
     async def go():
         cur = store
-        c = build(cur)
         real_dt, real_hv = m.datetime, homeview.datetime
 
         class _DT(real_dt):
@@ -357,6 +356,10 @@ def run_night(spec):
 
         m.datetime = homeview.datetime = _DT
         try:
+            # TEST-37: built under the scenario's clock, not the real one:
+            # Controller.__init__ checks a stored latch's end against now().
+            clock[0] = start
+            c = build(cur)
             for t_pre in EVENING:
                 clock[0] = t_pre
                 await c._read_forecast()