diff --git a/src/bin/psql/psql.c b/src/bin/psql/psql.c
index 1645a5ec8d7..e7c13ba2a7f 100644
--- a/src/bin/psql/psql.c
+++ b/src/bin/psql/psql.c
@@ -7,7 +7,7 @@
  *
  *
  * IDENTIFICATION
- *    $Header: /cvsroot/pgsql/src/bin/psql/Attic/psql.c,v 1.30 1996/11/20 22:34:36 momjian Exp $
+ *    $Header: /cvsroot/pgsql/src/bin/psql/Attic/psql.c,v 1.31 1996/11/22 04:43:48 bryanh Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -19,6 +19,7 @@
 #include <sys/stat.h>
 #include <unistd.h>
 #include <fcntl.h>
+#include <ctype.h>
 #include "postgres.h"
 #include "libpq-fe.h"
 #include "stringutils.h"