diff --git a/iolib.c b/iolib.c
index c2faf1c5..fb2c3b4b 100644
--- a/iolib.c
+++ b/iolib.c
@@ -1,5 +1,4 @@
 #include <stdio.h>
-#include <ctype.h>
 #include <string.h>
 #include <time.h>
 #include <stdlib.h>