diff --git a/user/tasks/examples/poll-ex.c b/user/tasks/examples/poll-ex.c
index 05cbb56..215c09b 100644
--- a/user/tasks/examples/poll-ex.c
+++ b/user/tasks/examples/poll-ex.c
@@ -10,7 +10,7 @@
 
 static char buffer[100];
 
-static bool fifo_init_ready = false;
+static volatile bool fifo_init_ready = false;
 
 void poll_task1(void)
 {