diff --git a/MCP4461/MCP4461.cpp b/MCP4461/MCP4461.cpp
index 4ad0d4a..d58836d 100644
--- a/MCP4461/MCP4461.cpp
+++ b/MCP4461/MCP4461.cpp
@@ -4,7 +4,7 @@
 Library to control the MCP4461 Digital Potentiometer over I2C.
 http://ww1.microchip.com/downloads/en/DeviceDoc/22265a.pdf
 This library does not fully implement the functionality of
-the MCP4461 – just the basics of changing the wiper values.
+the MCP4461 just the basics of changing the wiper values.
 Note this is currently configured to use the second I2C bus
 on the Due: Wire1
 The master joins the bus with the default address of 0
@@ -174,7 +174,7 @@ void MCP4461::setNonVolatileWipers(uint16_t wiper_value){
 }
 
 //return the value for a specific wiper
-uint16_t MCP4461::getNonVolatileWiper(uint8_t wiper){
+uint16_t MCP4461::getNonVolatileWiper(uint8_t wiper) const{
   uint16_t ret = 0;
   uint16_t c_byte =0;
   switch (wiper) {
diff --git a/MCP4461/MCP4461.h b/MCP4461/MCP4461.h
index 6b3e85c..a7d4396 100644
--- a/MCP4461/MCP4461.h
+++ b/MCP4461/MCP4461.h
@@ -40,7 +40,7 @@ class MCP4461{
   void setNonVolatileWipers(uint16_t);
   void toggleWiper(uint8_t); //NOT YET IMPLEMENTED
   uint16_t getVolatileWiper(uint8_t);
-  uint16_t getNonVolatileWiper(uint8_t);
+  uint16_t getNonVolatileWiper(uint8_t) const;
   uint16_t getStatus();
 
 private: