diff --git a/src/univ/textctrl.cpp b/src/univ/textctrl.cpp
index 1ac457b944..44dc03151d 100644
--- a/src/univ/textctrl.cpp
+++ b/src/univ/textctrl.cpp
@@ -129,6 +129,8 @@
 
 #if wxUSE_TEXTCTRL
 
+#include <ctype.h>
+
 #ifndef WX_PRECOMP
     #include "wx/log.h"