diff --git a/calendar/ChangeLog b/calendar/ChangeLog
index eb2f5c1a3e..1fac39dcf4 100644
--- a/calendar/ChangeLog
+++ b/calendar/ChangeLog
@@ -1,3 +1,7 @@
+1998-11-06  Miguel de Icaza  <miguel@nuclecu.unam.mx>
+
+	* calobj.c: Add ctype.h
+
 1998-10-31  Federico Mena Quintero  <federico@nuclecu.unam.mx>
 
 	* gnome-cal.c (gnome_calendar_direction): Add the offset from the
diff --git a/calendar/cal-util/calobj.c b/calendar/cal-util/calobj.c
index 9e5f41bc27..b50c8d63ea 100644
--- a/calendar/cal-util/calobj.c
+++ b/calendar/cal-util/calobj.c
@@ -8,6 +8,7 @@
  */
 #include <string.h>
 #include <glib.h>
+#include <ctype.h>
 #include "calobj.h"
 #include "timeutil.h"
 #include "versit/vcc.h"
diff --git a/calendar/calobj.c b/calendar/calobj.c
index 9e5f41bc27..b50c8d63ea 100644
--- a/calendar/calobj.c
+++ b/calendar/calobj.c
@@ -8,6 +8,7 @@
  */
 #include <string.h>
 #include <glib.h>
+#include <ctype.h>
 #include "calobj.h"
 #include "timeutil.h"
 #include "versit/vcc.h"
diff --git a/calendar/pcs/calobj.c b/calendar/pcs/calobj.c
index 9e5f41bc27..b50c8d63ea 100644
--- a/calendar/pcs/calobj.c
+++ b/calendar/pcs/calobj.c
@@ -8,6 +8,7 @@
  */
 #include <string.h>
 #include <glib.h>
+#include <ctype.h>
 #include "calobj.h"
 #include "timeutil.h"
 #include "versit/vcc.h"