diff --git a/sys/arm64/rockchip/rk_i2s.c b/sys/arm64/rockchip/rk_i2s.c
index 08fbbd7915b..3d6aaf523c4 100644
--- a/sys/arm64/rockchip/rk_i2s.c
+++ b/sys/arm64/rockchip/rk_i2s.c
@@ -50,8 +50,6 @@
 #include <dev/sound/fdt/audio_dai.h>
 #include "audio_dai_if.h"
 
-#define	AUDIO_BUFFER_SIZE	48000 * 4
-
 #define	I2S_TXCR	0x0000
 #define		I2S_CSR_2		(0 << 15)
 #define		I2S_CSR_4		(1 << 15)