diff --git a/Outputs/Speaker/Implementation/LowpassSpeaker.hpp b/Outputs/Speaker/Implementation/LowpassSpeaker.hpp
index 9cdb752f1..7a8ac79f1 100644
--- a/Outputs/Speaker/Implementation/LowpassSpeaker.hpp
+++ b/Outputs/Speaker/Implementation/LowpassSpeaker.hpp
@@ -17,6 +17,7 @@
 
 #include <mutex>
 #include <cstring>
+#include <cmath>
 
 namespace Outputs {
 namespace Speaker {