diff --git a/Adafruit_MAX31865.cpp b/Adafruit_MAX31865.cpp
index c5690b1..af326f1 100644
--- a/Adafruit_MAX31865.cpp
+++ b/Adafruit_MAX31865.cpp
@@ -161,13 +161,13 @@ void Adafruit_MAX31865::autoConvert(bool b) {
 /**************************************************************************/
 
 void Adafruit_MAX31865::enable50Hz(bool b) {
-  uint8_t t = readRegister8(MAX31856_CONFIG_REG);
+  uint8_t t = readRegister8(MAX31865_CONFIG_REG);
   if (b) {
-    t |= MAX31856_CONFIG_FILT50HZ;
+    t |= MAX31865_CONFIG_FILT50HZ;
   } else {
-    t &= ~MAX31856_CONFIG_FILT50HZ;
+    t &= ~MAX31865_CONFIG_FILT50HZ;
   }
-  writeRegister8(MAX31856_CONFIG_REG, t);
+  writeRegister8(MAX31865_CONFIG_REG, t);
 }
 
 /**************************************************************************/