diff --git a/afsk/ax25.c b/afsk/ax25.c
index 6c3b089e..807b65bd 100644
--- a/afsk/ax25.c
+++ b/afsk/ax25.c
@@ -18,6 +18,7 @@
  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#include <stdio.h>
 #include "ax25.h"
 #include <string.h>
 #include "ax5043.h"