diff --git a/source/blender/include/BIF_editfont.h b/source/blender/include/BIF_editfont.h
index d45ca41cd8c..f2099a77ae0 100644
--- a/source/blender/include/BIF_editfont.h
+++ b/source/blender/include/BIF_editfont.h
@@ -33,7 +33,7 @@
 #ifndef BIF_EDITFONT_H
 #define BIF_EDITFONT_H
 
-void do_textedit(unsigned short event, short val, char ascii);
+void do_textedit(unsigned short event, short val, unsigned char _ascii);
 void make_editText(void);
 void load_editText(void);
 void remake_editText(void);