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-rw-r--r--examples/kernel/mbox_send_wait.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/examples/kernel/mbox_send_wait.c b/examples/kernel/mbox_send_wait.c
index 569e8f0745..dc1e6295ee 100644
--- a/examples/kernel/mbox_send_wait.c
+++ b/examples/kernel/mbox_send_wait.c
@@ -41,7 +41,7 @@ static void thread1_entry(void* parameter)
static void thread2_entry(void* parameter)
{
rt_uint8_t count;
- unsigned char *str;
+ char *str;
count = 0;
while (1)