diff --git a/putty.h b/putty.h
index 416f8903..fd2d0250 100644
--- a/putty.h
+++ b/putty.h
@@ -671,6 +671,7 @@ enum {
     BUSY_CPU	    /* Locally busy (e.g. crypto); user interaction suspended */
 };
 void set_busy_status(void *frontend, int status);
+int frontend_is_utf8(void *frontend);
 
 void cleanup_exit(int);
 
diff --git a/unix/unix.h b/unix/unix.h
index 76ec7531..cf297db3 100644
--- a/unix/unix.h
+++ b/unix/unix.h
@@ -125,7 +125,6 @@ void gtkcomm_setup(void);
 const char *get_x_display(void *frontend);
 int font_dimension(void *frontend, int which);/* 0 for width, 1 for height */
 long get_windowid(void *frontend);
-int frontend_is_utf8(void *frontend);
 
 /* Things gtkdlg.c needs from pterm.c */
 void *get_window(void *frontend);      /* void * to avoid depending on gtk.h */