diff --git a/app/menu.c b/app/menu.c
index f0e6107..250a74f 100644
--- a/app/menu.c
+++ b/app/menu.c
@@ -13,6 +13,7 @@
  *     See the License for the specific language governing permissions and
  *     limitations under the License.
  */
+#include <stdio.h>
 #include "app/mdc1200.h"
 #include <string.h>
 #include "driver/uart.h"