diff --git a/OpenAudio_ArduinoLibrary.h b/OpenAudio_ArduinoLibrary.h
index 133bf06..c43f69e 100644
--- a/OpenAudio_ArduinoLibrary.h
+++ b/OpenAudio_ArduinoLibrary.h
@@ -19,6 +19,7 @@
 #include <AudioFilterIIR_F32.h>
 #include "AudioLMSDenoiseNotch_F32.h"
 #include "AudioMathAdd_F32.h"
+#include "AudioMathConstant_F32.h"
 #include "AudioMathMultiply_F32.h"
 #include "AudioMathOffset_F32.h"
 #include "AudioMathScale_F32.h"