diff --git a/src/amdmasync.cpp b/src/amdmasync.cpp
index ff4d76a..fc51c53 100644
--- a/src/amdmasync.cpp
+++ b/src/amdmasync.cpp
@@ -22,6 +22,7 @@ This program is free software: you can redistribute it and/or modify
 #include <math.h>
 #include <time.h>
 #include <sched.h>
+#include <stdlib.h>
 
 
 amdmasync::amdmasync(uint64_t TuneFrequency,uint32_t SR,int Channel,uint32_t FifoSize):bufferdma(Channel,FifoSize,3,2)
diff --git a/src/dsp.cpp b/src/dsp.cpp
index 33f26f6..e6ff654 100644
--- a/src/dsp.cpp
+++ b/src/dsp.cpp
@@ -17,6 +17,7 @@ This program is free software: you can redistribute it and/or modify
 
 
 #include "dsp.h"
+#include <stdlib.h>
 
 dsp::dsp()
 {