1 files changed, 1 insertions, 0 deletions

diff --git a/input.c b/input.c
index 452eac7f..a2c63e14 100644
--- a/input.c
+++ b/input.c
@@ -20,6 +20,7 @@
 
 #include <netinet/in.h>
 
+#include <ctype.h>
 #include <resolv.h>
 #include <stdlib.h>
 #include <string.h>