diff --git a/harbour/ChangeLog b/harbour/ChangeLog
index 652ae0d37f..f0f892d59c 100644
--- a/harbour/ChangeLog
+++ b/harbour/ChangeLog
@@ -1,3 +1,8 @@
+2000-06-15 15:00 UTC-0400 David G. Holm <dholm@jsd-llc.com>
+
+   * source/rtl/gtwin/gtwin.c
+     ! Added '#include <ctype.h>' for the tolower() prototype.
+
 2000-06-14 22:37 UTC-0800 Ron Pinkas <Ron@Profit-Master.com>
    * source/pp/ppcomp.c
      ! Fixed missing CR at EOF of #include file, causing #line directive to be on same line with the next line in parrent file.
diff --git a/harbour/source/rtl/gtwin/gtwin.c b/harbour/source/rtl/gtwin/gtwin.c
index 677a279ccf..a0beb5ff50 100644
--- a/harbour/source/rtl/gtwin/gtwin.c
+++ b/harbour/source/rtl/gtwin/gtwin.c
@@ -60,6 +60,7 @@
 
 #include <stdlib.h>
 #include <string.h>
+#include <ctype.h>
 
 #define HB_OS_WIN_32_USED