diff --git a/ChangeLog b/ChangeLog
index d993b0eead..ebfc2e9a54 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Sun Sep 10 09:41:29 2006  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* file.c: ISPRINT() needs ctype.h
+
 Sun Sep 10 09:19:47 2006  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* lib/optparse.rb: splat parsed arguments.
diff --git a/file.c b/file.c
index 94de21b3b0..a8df504ae1 100644
--- a/file.c
+++ b/file.c
@@ -39,6 +39,8 @@ int flock(int, int);
 # define MAXPATHLEN 1024
 #endif
 
+#include <ctype.h>
+
 #include <time.h>
 
 VALUE rb_time_new(time_t, time_t);