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-rw-r--r--src/lib/audio_filter.cc1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/lib/audio_filter.cc b/src/lib/audio_filter.cc
index 96af75674..ed4657328 100644
--- a/src/lib/audio_filter.cc
+++ b/src/lib/audio_filter.cc
@@ -21,6 +21,7 @@
#include "audio_filter.h"
#include "audio_buffers.h"
+#include "maths_util.h"
#include "util.h"
#include <cmath>