diff --git a/search/CheckTiming.cc b/search/CheckTiming.cc
index c658f54a..1c84ef83 100644
--- a/search/CheckTiming.cc
+++ b/search/CheckTiming.cc
@@ -31,6 +31,7 @@
 #include "Search.hh"
 #include "Genclks.hh"
 #include "PathVertex.hh"
+#include "Sim.hh"
 
 namespace sta {
 
@@ -101,7 +102,8 @@ CheckTiming::checkNoInputDelay()
     if (!sdc_->isClock(pin)) {
       PortDirection *dir = network_->direction(pin);
       if (dir->isAnyInput()
-	  && !sdc_->hasInputDelay(pin))
+	  && !sdc_->hasInputDelay(pin)
+          && !sim_->logicZeroOne(pin))
 	no_arrival.insert(pin);
     }
   }
@@ -128,7 +130,8 @@ CheckTiming::checkNoOutputDelay(PinSet &no_departure)
     const Pin *pin = pin_iter->next();
     PortDirection *dir = network_->direction(pin);
     if (dir->isAnyOutput()
-	&& !sdc_->hasOutputDelay(pin))
+	&& !sdc_->hasOutputDelay(pin)
+        && !sim_->logicZeroOne(pin))
       no_departure.insert(pin);
   }
   delete pin_iter;