diff --git a/src/CubicSDRDefs.h b/src/CubicSDRDefs.h
index f1ec469..404cb56 100644
--- a/src/CubicSDRDefs.h
+++ b/src/CubicSDRDefs.h
@@ -1,7 +1,12 @@
 #pragma once
 
+#ifdef __APPLE__
+#define BUF_SIZE (16384*3)
+#define SRATE 2000000
+#else
 #define BUF_SIZE (16384*4)
 #define SRATE 2500000
+#endif
 #define FFT_SIZE 2048
 
 #define DEFAULT_FREQ 98900000