diff --git a/examples/spectrum-scanner/main.c b/examples/spectrum-scanner/main.c
index c95cd8dc7a..96e31dc6ed 100644
--- a/examples/spectrum-scanner/main.c
+++ b/examples/spectrum-scanner/main.c
@@ -20,6 +20,7 @@
  */
 
 #include <stdint.h>
+#include <stdio.h>
 #include <math.h>
 
 #include "fmt.h"