diff --git a/examples/salt_io.h b/examples/salt_io.h
index 73b70e4..d40acc6 100644
--- a/examples/salt_io.h
+++ b/examples/salt_io.h
@@ -6,6 +6,6 @@
 salt_ret_t my_write(salt_io_channel_t *p_wchannel);
 salt_ret_t my_read(salt_io_channel_t *p_rchannel);
 
-salt_time_t my_time;
+extern salt_time_t my_time;
 
 #endif /* SALT_IO_H */