diff --git a/artiq/test/coredevice/test_analyzer.py b/artiq/test/coredevice/test_analyzer.py
index 93d359b01..c8e506c23 100644
--- a/artiq/test/coredevice/test_analyzer.py
+++ b/artiq/test/coredevice/test_analyzer.py
@@ -12,6 +12,8 @@ class CreateTTLPulse(EnvExperiment):
 
     @kernel
     def run(self):
+        self.loop_in.input()
+        delay_mu(8)
         with parallel:
             self.loop_in.gate_both_mu(1200)
             with sequential:
diff --git a/artiq/test/coredevice/test_rtio.py b/artiq/test/coredevice/test_rtio.py
index a0b3252ee..fdeda05c7 100644
--- a/artiq/test/coredevice/test_rtio.py
+++ b/artiq/test/coredevice/test_rtio.py
@@ -152,6 +152,7 @@ class LoopbackCount(EnvExperiment):
 
     @kernel
     def run(self):
+        self.loop_in.input()
         self.loop_out.output()
         delay(5*us)
         with parallel: