diff --git a/drivers/crypto/hisilicon/qm.c b/drivers/crypto/hisilicon/qm.c
index 180589c73663..959f4846aa23 100644
--- a/drivers/crypto/hisilicon/qm.c
+++ b/drivers/crypto/hisilicon/qm.c
@@ -252,7 +252,6 @@
 #define QM_QOS_MIN_CIR_B		100
 #define QM_QOS_MAX_CIR_U		6
 #define QM_QOS_MAX_CIR_S		11
-#define QM_QOS_VAL_MAX_LEN		32
 #define QM_DFX_BASE		0x0100000
 #define QM_DFX_STATE1		0x0104000
 #define QM_DFX_STATE2		0x01040C8
@@ -4626,7 +4625,7 @@ static ssize_t qm_get_qos_value(struct hisi_qm *qm, const char *buf,
 			       unsigned int *fun_index)
 {
 	char tbuf_bdf[QM_DBG_READ_LEN] = {0};
-	char val_buf[QM_QOS_VAL_MAX_LEN] = {0};
+	char val_buf[QM_DBG_READ_LEN] = {0};
 	u32 tmp1, device, function;
 	int ret, bus;