diff --git a/src/Elements.cpp b/src/Elements.cpp
index 69daea0..881ba92 100644
--- a/src/Elements.cpp
+++ b/src/Elements.cpp
@@ -1,5 +1,6 @@
 #include <string.h>
 #include "AudibleInstruments.hpp"
+#include "dsp/functions.hpp"
 #include "dsp/samplerate.hpp"
 #include "dsp/ringbuffer.hpp"
 #include "elements/dsp/part.h"
diff --git a/src/Rings.cpp b/src/Rings.cpp
index 8a24dac..0a09b6e 100644
--- a/src/Rings.cpp
+++ b/src/Rings.cpp
@@ -1,5 +1,6 @@
 #include <string.h>
 #include "AudibleInstruments.hpp"
+#include "dsp/functions.hpp"
 #include "dsp/samplerate.hpp"
 #include "dsp/ringbuffer.hpp"
 #include "dsp/digital.hpp"