diff --git a/lib/oscillator.h b/lib/oscillator.h
index abb1428..778c98d 100644
--- a/lib/oscillator.h
+++ b/lib/oscillator.h
@@ -1,6 +1,7 @@
 #pragma once
 
 #include "constants.h"
+#include <math.h>
 
 typedef struct {
 	float phase;