diff --git a/src/pipeline/ToneInterfererStep.cpp b/src/pipeline/ToneInterfererStep.cpp
index 725b9d684..2b811c4b2 100644
--- a/src/pipeline/ToneInterfererStep.cpp
+++ b/src/pipeline/ToneInterfererStep.cpp
@@ -23,9 +23,12 @@
 #include <cassert>
 #include <cstring>
 #include <cmath>
-#include "../util.h"
 #include "ToneInterfererStep.h"
 
+#ifndef M_PI
+#define M_PI    3.14159265358979323846
+#endif
+
 ToneInterfererStep::ToneInterfererStep(
         int sampleRate, std::function<float()> toneFrequencyFn, 
         std::function<float()> toneAmplitudeFn, std::function<float*()> tonePhaseFn)