diff --git a/biscuit/c/audio_hello.c b/biscuit/c/audio_hello.c
index 9a0ca90..98863ec 100644
--- a/biscuit/c/audio_hello.c
+++ b/biscuit/c/audio_hello.c
@@ -30,12 +30,7 @@ int main(int argc, char **argv)
         fprintf(stdout, "fail to open /dev/gpio");
         return 1;
     }
-    if (ioctl(fd_gpio, 1, NULL) != 0) {
-        fprintf(stdout, "fail to use ioctl on /dev/gpio");
-        return 1;
-    }
-    write(fd_gpio, "1", 1);
-    if (ioctl(fd_gpio, 2, NULL) != 0) {
+    if (ioctl(fd_gpio, 40, NULL) != 0) {
         fprintf(stdout, "fail to use ioctl on /dev/gpio");
         return 1;
     }