diff --git a/arch/risc-v/src/bl602/bl602_i2c.c b/arch/risc-v/src/bl602/bl602_i2c.c
index aafa185ae6d..1ca0d7fb5ce 100644
--- a/arch/risc-v/src/bl602/bl602_i2c.c
+++ b/arch/risc-v/src/bl602/bl602_i2c.c
@@ -153,7 +153,7 @@ static struct bl602_i2c_priv_s bl602_i2c0_priv =
   .subaddr  = 0,
   .sublen   = 0,
   .lock     = NXMUTEX_INITIALIZER,
-  .sem_isr  = SEM_INITIALIZER(0),
+  .sem_isr  = SEM_INITIALIZER(1),
   .i2cstate = EV_I2C_END_INT,
   .msgv     = NULL,
   .msgid    = 0,