diff --git a/libraries/OneWire/OneWire.cpp b/libraries/OneWire/OneWire.cpp
index 631813f8e..593053794 100644
--- a/libraries/OneWire/OneWire.cpp
+++ b/libraries/OneWire/OneWire.cpp
@@ -119,7 +119,7 @@ sample code bearing this copyright.
 
 OneWire::OneWire(uint8_t pin)
 {
-	pinMode(pin, INPUT);
+	pinMode(pin, INPUT_PULLUP);
 	bitmask = PIN_TO_BITMASK(pin);
 	baseReg = PIN_TO_BASEREG(pin);
 #if ONEWIRE_SEARCH