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-rw-r--r--drivers/serial/sandbox.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/serial/sandbox.c b/drivers/serial/sandbox.c
index 2f7bc24887..1af5cc12f3 100644
--- a/drivers/serial/sandbox.c
+++ b/drivers/serial/sandbox.c
@@ -33,7 +33,7 @@ DECLARE_GLOBAL_DATA_PTR;
* serial_buf_write == serial_buf_read -> empty buffer
* (serial_buf_write + 1) % 16 == serial_buf_read -> full buffer
*/
-static char serial_buf[16];
+static unsigned char serial_buf[16];
static unsigned int serial_buf_write;
static unsigned int serial_buf_read;