diff --git a/OneWireSlave.cpp b/OneWireSlave.cpp
index ca57ba3..dd456d8 100644
--- a/OneWireSlave.cpp
+++ b/OneWireSlave.cpp
@@ -53,8 +53,8 @@ byte OneWireSlave::rom_[8];
 byte OneWireSlave::scratchpad_[8];
 Pin OneWireSlave::pin_;
 
-unsigned long OneWireSlave::resetStart_;
-unsigned long OneWireSlave::lastReset_;
+unsigned long OneWireSlave::resetStart_ = 0;;
+unsigned long OneWireSlave::lastReset_ = 0;
 
 void(*OneWireSlave::receiveBitCallback_)(bool bit, bool error);
 void(*OneWireSlave::bitSentCallback_)(bool error);