diff --git a/src/pvaClientMultiGetDouble.cpp b/src/pvaClientMultiGetDouble.cpp
index 3697337..7c5a5e5 100644
--- a/src/pvaClientMultiGetDouble.cpp
+++ b/src/pvaClientMultiGetDouble.cpp
@@ -121,7 +121,7 @@ epics::pvData::shared_vector<double> PvaClientMultiGetDouble::get()
             PVStructurePtr pvStructure = pvaClientGet[i]->getData()->getPVStructure();
             doubleValue[i] = convert->toDouble(pvStructure->getSubField<PVScalar>("value"));
         } else {
-            doubleValue[i] = nan("");
+            doubleValue[i] = epicsNAN;
         }
     }
     return doubleValue;
diff --git a/src/pvaClientMultiMonitorDouble.cpp b/src/pvaClientMultiMonitorDouble.cpp
index c0efd28..00eeb2f 100644
--- a/src/pvaClientMultiMonitorDouble.cpp
+++ b/src/pvaClientMultiMonitorDouble.cpp
@@ -45,7 +45,7 @@ PvaClientMultiMonitorDouble::PvaClientMultiMonitorDouble(
 : pvaClientMultiChannel(pvaClientMultiChannel),
   pvaClientChannelArray(pvaClientChannelArray),
   nchannel(pvaClientChannelArray.size()),
-  doubleValue(shared_vector<double>(nchannel,nan(""))),
+  doubleValue(shared_vector<double>(nchannel,epicsNAN)),
   pvaClientMonitor(std::vector<PvaClientMonitorPtr>(nchannel,PvaClientMonitorPtr())),
   isMonitorConnected(false),
   isDestroyed(false)