1 files changed, 1 insertions, 0 deletions

diff --git a/pop3.c b/pop3.c
index 2b771914..79260f16 100644
--- a/pop3.c
+++ b/pop3.c
@@ -8,6 +8,7 @@
 
 #include  <stdio.h>
 #include  <string.h>
+#include  <ctype.h>
 #if defined(HAVE_UNISTD_H)
 #include <unistd.h>
 #endif