diff --git a/keyboard.c b/keyboard.c
index 45247d9..471d18f 100644
--- a/keyboard.c
+++ b/keyboard.c
@@ -107,6 +107,7 @@
 		v3270_draw_shift_status(terminal);
 	}
 
+#ifdef KEY_FLAG_ALT
 	if(keyval_is_alt())
 	{
 		if(status)
@@ -115,6 +116,7 @@
 			terminal->keyflags &= ~KEY_FLAG_ALT;
 		v3270_draw_alt_status(terminal);
 	}
+#endif // KEY_FLAG_ALT
 
  }
 
diff --git a/oia.c b/oia.c
index ff350ec..b9eaa72 100644
--- a/oia.c
+++ b/oia.c
@@ -887,7 +887,9 @@ static void update_text_field(v3270 *terminal, gboolean flag, V3270_OIA_FIELD id
 
 void v3270_draw_alt_status(v3270 *terminal)
 {
+#ifdef KEY_FLAG_ALT
 	update_text_field(terminal,terminal->keyflags & KEY_FLAG_ALT,V3270_OIA_ALT,'A');
+#endif // KEY_FLAG_ALT
 }
 
 void v3270_draw_ins_status(v3270 *terminal)
diff --git a/private.h b/private.h
index 95fc3a6..966d13f 100644
--- a/private.h
+++ b/private.h
@@ -62,7 +62,10 @@ G_BEGIN_DECLS
  #define OIA_TOP_MARGIN 2
 
  #define KEY_FLAG_SHIFT	0x0001
- #define KEY_FLAG_ALT	0x0002
+
+ #ifndef WIN32
+  #define KEY_FLAG_ALT	0x0002
+ #endif // !WIN32
 
  enum
  {
--
libgit2 0.21.2