diff --git a/src/Keithley_6517.cpp b/src/Keithley_6517.cpp
index d0abba2ae03faf5590f39d28722b6c64458eecc7..c506a0dbecbe903d28ce8946c05db46d71a69ca2 100644
--- a/src/Keithley_6517.cpp
+++ b/src/Keithley_6517.cpp
@@ -43,7 +43,7 @@ static const unsigned short MAX_SAVED_CONFIG = 9;
 // ============================================================================
 Keithley_6517::Keithley_6517 (std::string& comLink_device_name):
 AbstractElectrometerClass(comLink_device_name),
-_kmode("")
+_kmode(""), _numPLC(0)
 {
 	std::cout << "Keithley_6517::Keithley_6517 <-" << std::endl;