diff --git a/arch/sim/src/sim/up_hcitty.c b/arch/sim/src/sim/up_hcitty.c
index 6bf99ab197..b592ace484 100644
--- a/arch/sim/src/sim/up_hcitty.c
+++ b/arch/sim/src/sim/up_hcitty.c
@@ -330,7 +330,7 @@ static int bthcitty_poll(FAR struct file *filep,
 {
   FAR struct inode *inode = filep->f_inode;
   FAR struct bthcitty_s *dev = inode->i_private;
-  pollevent_t eventset;
+  pollevent_t eventset = 0;
   int ret;
   int i;