diff --git a/litex/soc/software/libnet/tftp.c b/litex/soc/software/libnet/tftp.c
index 65885de9b..439b3e075 100644
--- a/litex/soc/software/libnet/tftp.c
+++ b/litex/soc/software/libnet/tftp.c
@@ -6,6 +6,7 @@
 
 // License: BSD
 
+#include <stdio.h>
 #include <stdint.h>
 #include <string.h>