diff --git a/src/ArduinoTapTempo.cpp b/src/ArduinoTapTempo.cpp
index 8b4c683..3d8efa3 100644
--- a/src/ArduinoTapTempo.cpp
+++ b/src/ArduinoTapTempo.cpp
@@ -43,7 +43,7 @@ float ArduinoTapTempo::getBPM()
   return 60000.0 / beatLengthMS;
 }
 
-float ArduinoTapTempo::setBPM(float bpm)
+void ArduinoTapTempo::setBPM(float bpm)
 {
   beatLengthMS = 60000 / bpm;
 }
diff --git a/src/ArduinoTapTempo.h b/src/ArduinoTapTempo.h
index 55f54ad..c80c492 100644
--- a/src/ArduinoTapTempo.h
+++ b/src/ArduinoTapTempo.h
@@ -38,7 +38,7 @@ class ArduinoTapTempo
     bool isChainActive(); // returns true if the current tap chain is still accepting new taps to fine tune the tempo
     bool isChainActive(unsigned long ms); // returns true if the current tap chain is still accepting new taps to fine tune the tempo
     float getBPM(); // returns the number of beats per minute
-    float setBPM(float bpm); // sets the number of beats per minute
+    void setBPM(float bpm); // sets the number of beats per minute
     float beatProgress(); // returns a float from 0.0 to 1.0 indicating the percent through the current beat
     void resetTapChain(); // resets the current chain of taps and sets the start of the bar to the current time
     void resetTapChain(unsigned long ms); // resets the current chain of taps and sets the start of the bar to the current time