diff --git a/src/option.h b/src/option.h
index 28a4a96..75940cc 100644
--- a/src/option.h
+++ b/src/option.h
@@ -637,7 +637,7 @@
 EXTERN char_u	*p_guifontwide;	// 'guifontwide'
 EXTERN int	p_guipty;	// 'guipty'
 #endif
-#ifdef FEAT_GUI_GTK
+#if defined(FEAT_GUI_GTK) || defined(FEAT_GUI_MSWIN)
 EXTERN char_u	*p_guiligatures;  // 'guiligatures'
 # endif
 #if defined(FEAT_GUI_GTK) || defined(FEAT_GUI_X11)